diff --git a/repository/apps/app-nbcompose.lua b/repository/apps/app-nbcompose.lua
new file mode 100644
index 0000000..c7417d1
--- /dev/null
+++ b/repository/apps/app-nbcompose.lua
@@ -0,0 +1,345 @@
+-- This is released into the public domain.
+-- No warranty is provided, implied or otherwise.
+
+-- app-nbcompose.lua : Music!
+-- Authors: 20kdc
+
+local nb = neo.requireAccess("c.iron_noteblock", "noteblocks").list()()
+local ic = neo.requireAccess("x.neo.pub.base", "fs")
+
+local event = require("event")(neo)
+local neoux = require("neoux")(event, neo)
+
+local iTranslation = {
+ [0] = 0, -- piano / air (def)
+ 4, -- double bass / wood (def)
+ 1, -- bass drum / stone (def)
+ 2, -- snare drum / sand (def)
+ 3,  -- click / glass (def)
+-- JUST GIVE UP
+ 4, -- guitar / wool 
+ 5, -- flute / clay
+ 6, -- bell / gold
+ 6, -- chime / pice
+ 6, -- xylo / bone
+}
+local instKey = {
+ [2] = 0,
+ [3] = 1,
+ [4] = 2,
+ [5] = 3,
+ [6] = 4,
+ [144] = 5,
+ [7] = 5,
+ [8] = 6,
+ [9] = 7,
+ [10] = 8,
+ [11] = 9
+}
+local noteKey = "1q2w3er5t6yu8i9o0pzsxdcvg"
+-- Application State
+local fileData
+local uptime = os.uptime()
+local songPosition = 0
+local selectionL, selectionR = -8, -9
+local running = true
+local playing = false
+local timerExistsFlag = false
+local window
+local defInst = 0
+--
+local tick -- Tick function for timer making
+
+local file = require("knbs").new()
+-- Window width is always 50. Height is layers + 3, for the top bar.
+
+local theStatusBar, theNotePane, genMain
+
+local function updateStatusAndPane()
+ if theStatusBar.update then theStatusBar.update(window) end
+ if theNotePane then
+  for _, v in ipairs(theNotePane) do
+   v.update(window)
+  end
+ end
+end
+
+local function commonKey(a, c, f)
+ if a == 32 then
+  playing = not playing
+  theStatusBar.update(window)
+  if playing then
+   if not timerExistsFlag then
+    uptime = os.uptime()
+    event.runAt(uptime, tick)
+    timerExistsFlag = true
+   end
+  end
+ elseif a == 91 then
+  selectionL = songPosition
+  updateStatusAndPane()
+ elseif a == 93 then
+  selectionR = songPosition
+  updateStatusAndPane()
+ elseif c == 203 and (f.shift or f.rshift) then
+  songPosition = 0
+  updateStatusAndPane()
+ elseif c == 205 and (f.shift or f.rshift) then
+  songPosition = file.length
+  updateStatusAndPane()
+ elseif c == 203 then
+  songPosition = math.max(0, songPosition - 1)
+  updateStatusAndPane()
+ elseif c == 205 then
+  songPosition = songPosition + 1
+  updateStatusAndPane()
+ end
+end
+
+theStatusBar = {
+ x = 1,
+ y = 3,
+ w = 50,
+ h = 1,
+ selectable = true,
+ line = function (window, x, y, lined, bg, fg, selected)
+  if selected then
+   bg, fg = fg, bg
+  end
+  window.span(x, y, ((playing and "Playing") or "Paused") .. " (SPACE) ; " .. (songPosition + 1) .. "/" .. file.length .. " ([Shift-]←/→)", bg, fg)
+ end,
+ key = function (window, update, a, c, d, f)
+  if not d then return end
+  commonKey(a, c, f)
+ end
+}
+
+local function genLayers()
+ theStatusBar.update = nil
+ theNotePane = nil
+ local layers = {}
+ for i = 1, file.height do
+  local layer = i - 1
+  table.insert(layers, neoux.tcfield(1, i + 1, 40, function (tx)
+   file.layers[layer][1] = tx or file.layers[layer][1]
+   return file.layers[layer][1]
+  end))
+  table.insert(layers, neoux.tcrawview(42, i + 1, {"Vol."}))
+  table.insert(layers, neoux.tcfield(46, i + 1, 5, function (tx)
+   if tx then
+    file.layers[layer][2] = math.max(0, math.min(255, math.floor(tonumber(tx) or 0)))
+   end
+   return tostring(file.layers[layer][2])
+  end))
+ end
+ return 50, file.height + 1, nil, neoux.tcwindow(50, file.height + 1, {
+  neoux.tcbutton(1, 1, "Purge Extra Layers", function (w)
+   local knbs = require("knbs")
+   local layerCount = knbs.correctSongLH(file)
+   knbs.resizeLayers(file, layerCount)
+   w.reset(genLayers())
+  end),
+  neoux.tcbutton(21, 1, "Del.Last", function (w)
+   require("knbs").resizeLayers(file, file.height - 1)
+   w.reset(genLayers())
+  end),
+  neoux.tcbutton(31, 1, "Append", function (w)
+   require("knbs").resizeLayers(file, file.height + 1)
+   w.reset(genLayers())
+  end),
+  table.unpack(layers)
+ }, function (w)
+  w.reset(genMain())
+ end, 0xFFFFFF, 0)
+end
+function genMain()
+ theNotePane = {}
+ for l = 1, file.height do
+  local layer = l - 1
+  theNotePane[l] = {
+   x = 1,
+   y = 3 + l,
+   w = 50,
+   h = 1,
+   selectable = true,
+   line = function (window, x, y, lined, bg, fg, selected)
+    if selected then
+     bg, fg = fg, bg
+    end
+    local text = ""
+    for i = 1, 5 do
+     local noteL, noteR = " ", " "
+     local tick = songPosition + i - 3
+     if songPosition == tick then
+      noteL = "["
+      noteR = "]"
+     end
+     if selectionR >= selectionL then
+      if selectionL == tick then
+       noteL = "{"
+      end
+      if selectionR == tick then
+       noteR = "}"
+      end
+     end
+     text = text .. noteL
+     local fd = file.ticks[tick]
+     fd = fd and fd[layer]
+     if fd then
+      text = text .. string.format("   %02i/%02i", fd[1], fd[2])
+     else
+      text = text .. "        "
+     end
+     text = text .. noteR
+    end
+    window.span(x, y, text, bg, fg)
+   end,
+   key = function (window, update, a, c, d, f)
+    if not d then return end
+    commonKey(a, c, f)
+    if a == 8 then
+     if file.ticks[songPosition] then
+      file.ticks[songPosition][layer] = nil
+      require("knbs").correctSongLH(file)
+      update()
+      theStatusBar.update(window)
+     end
+    elseif instKey[c] and (f.shift or f.rshift) then
+     file.ticks[songPosition] = file.ticks[songPosition] or {}
+     defInst = instKey[c]
+     local nt = 45
+     if file.ticks[songPosition][layer] then
+      file.ticks[songPosition][layer][1] = defInst
+      nt = file.ticks[songPosition][layer][2]
+     end
+     nb.playNote(iTranslation[defInst] or 0, nt - 33, file.layers[layer][2] / 100)
+     require("knbs").correctSongLH(file)
+     update()
+     theStatusBar.update(window)
+    elseif a >= 0 and a < 256 and noteKey:find(string.char(a), 1, true) then
+     file.ticks[songPosition] = file.ticks[songPosition] or {}
+     local note = noteKey:find(string.char(a), 1, true) - 1
+     file.ticks[songPosition][layer] = {defInst, note + 33}
+     nb.playNote(iTranslation[defInst] or 0, note, file.layers[layer][2] / 100)
+     require("knbs").correctSongLH(file)
+     update()
+     theStatusBar.update(window)
+    elseif a == 123 then
+     if selectionR >= selectionL then
+      local storage = {}
+      for i = selectionL, selectionR do
+       storage[i] = file.ticks[i] and file.ticks[i][layer] and {table.unpack(file.ticks[i][layer])}
+      end
+      for i = selectionL, selectionR do
+       local p = songPosition + (i - selectionL)
+       file.ticks[p] = file.ticks[p] or {}
+       file.ticks[p][layer] = storage[i]
+      end
+      require("knbs").correctSongLH(file)
+      update()
+      theStatusBar.update(window)
+     end
+    end
+   end
+  }
+ end
+ -- We totally lie about the height here to tcwindow. "Bit of a cheat, but who's counting", anyone?
+ -- It is explicitly documented that the width and height are for background drawing, BTW.
+ return 50, file.height + 3, nil, neoux.tcwindow(50, 3, {
+  neoux.tcfield(1, 1, 20, function (tx)
+   file.name = tx or file.name
+   return file.name
+  end),
+  neoux.tcfield(21, 1, 15, function (tx)
+   file.transcriptor = tx or file.transcriptor
+   return file.transcriptor
+  end),
+  neoux.tcfield(36, 1, 15, function (tx)
+   file.songwriter = tx or file.songwriter
+   return file.songwriter
+  end),
+  neoux.tcbutton(1, 2, "New", function (w)
+   file = require("knbs").new()
+   songPosition = 0
+   playing = false
+   window.reset(genMain())
+  end),
+  neoux.tcbutton(6, 2, "Load", function (w)
+   neoux.fileDialog(false, function (f)
+    if not f then return end
+    file = nil
+    file = require("knbs").deserialize(f.read("*a"))
+    f.close()
+    songPosition = 0
+    playing = false
+    window.reset(genMain())
+   end)
+  end),
+  neoux.tcbutton(12, 2, "Save", function (w)
+   neoux.fileDialog(true, function (f)
+    if not f then return end
+    require("knbs").serialize(file, f.write)
+    f.close()
+   end)
+  end),
+  neoux.tcbutton(18, 2, "Ds.L", function (w)
+   neoux.fileDialog(false, function (f)
+    if not f then return end
+    file.description = f.read("*a")
+    f.close()
+   end)
+  end),
+  neoux.tcbutton(24, 2, "Ds.S", function (w)
+   neoux.fileDialog(true, function (f)
+    if not f then return end
+    f.write(file.description)
+    f.close()
+   end)
+  end),
+  neoux.tcbutton(30, 2, "Layers", function (w)
+   window.reset(genLayers())
+  end),
+  neoux.tcrawview(39, 2, {"qT/S"}),
+  neoux.tcfield(43, 2, 8, function (tx)
+   if tx then
+    local txn = tonumber(tx) or 0
+    file.tempo = math.min(math.max(0, math.floor(txn * 4)), 65535)
+   end
+   return tostring(math.floor(file.tempo / 25))
+  end),
+  theStatusBar,
+  table.unpack(theNotePane)
+ }, function (w)
+  w.close()
+  running = false
+ end, 0xFFFFFF, 0)
+end
+
+function tick()
+ if playing then
+  -- Stop the user from entering such a low tempo that stuff freezes by:
+  -- 1. Stopping tempo from going too low to cause /0
+  -- 2. Ensuring timer is at most 1 second away
+  local temp = 1 / math.max(file.tempo / 100, 0.01)
+  if os.uptime() >= uptime + temp then
+   -- execute at this song position
+   if file.ticks[songPosition] then
+    for i = 0, file.height - 1 do
+     local tck = file.ticks[songPosition][i]
+     if tck then
+      nb.playNote(iTranslation[tck[1]] or 0, tck[2] - 33, file.layers[i][2] / 100)
+     end
+    end
+   end
+   songPosition = songPosition + 1
+   if songPosition >= file.length then songPosition = 0 end
+   updateStatusAndPane()
+   uptime = uptime + temp
+  end
+  event.runAt(math.min(os.uptime() + 1, uptime + temp), tick)
+ else
+  timerExistsFlag = false
+ end
+end
+window = neoux.create(genMain())
+while running do event.pull() end
diff --git a/repository/data/app-claw/local.lua b/repository/data/app-claw/local.lua
index f44920e..98b09e5 100644
--- a/repository/data/app-claw/local.lua
+++ b/repository/data/app-claw/local.lua
@@ -164,6 +164,24 @@ return {
    "docs/repoauthors/app-rsctrl"
   },
  },
+ ["app-nbcompose"] = {
+  desc = "Music player/composer using the NBS format",
+  v = 0,
+  deps = {
+   "neo",
+   "lib-knbs",
+   "zzz-license-pd"
+  },
+  dirs = {
+   "apps",
+   "docs",
+   "docs/repoauthors"
+  },
+  files = {
+   "apps/app-nbcompose.lua",
+   "docs/repoauthors/app-nbcompose"
+  },
+ },
  ["app-launchbar"] = {
   desc = "Application launcher bar",
   v = 0,
@@ -198,6 +216,23 @@ return {
    "docs/repoauthors/app-slaunch"
   },
  },
+ -- libraries
+ ["lib-knbs"] = {
+  desc = "NBS reader/writer library",
+  v = 0,
+  deps = {
+   "zzz-license-pd"
+  },
+  dirs = {
+   "libs",
+   "docs",
+   "docs/repoauthors"
+  },
+  files = {
+   "libs/knbs.lua",
+   "docs/repoauthors/lib-knbs"
+  },
+ },
  -- licenses (MUST BE IMMUTABLE)
  ["zzz-license-pd"] = {
   desc = "license file 'Public Domain'",
diff --git a/repository/docs/repoauthors/app-nbcompose b/repository/docs/repoauthors/app-nbcompose
new file mode 100644
index 0000000..fbe5fe4
--- /dev/null
+++ b/repository/docs/repoauthors/app-nbcompose
@@ -0,0 +1,2 @@
+repository/apps/app-nbcompose.lua: 20kdc, Public Domain
+
diff --git a/repository/docs/repoauthors/lib-knbs b/repository/docs/repoauthors/lib-knbs
new file mode 100644
index 0000000..d460ac2
--- /dev/null
+++ b/repository/docs/repoauthors/lib-knbs
@@ -0,0 +1,2 @@
+repository/libs/knbs.lua: 20kdc, Public Domain
+
diff --git a/repository/libs/knbs.lua b/repository/libs/knbs.lua
new file mode 100644
index 0000000..3ce12b4
--- /dev/null
+++ b/repository/libs/knbs.lua
@@ -0,0 +1,203 @@
+-- This is released into the public domain.
+-- No warranty is provided, implied or otherwise.
+
+-- knbs.lua : Partial .nbs (Note Block Studio) R/W library
+-- Does not support custom instruments!
+-- Authors: 20kdc
+
+local function dsu16(str)
+ return
+  str:byte(1) +
+  (str:byte(2) * 256),
+  str:sub(3)
+end
+local function dsu32(str)
+ local a, str = dsu16(str)
+ local b, str = dsu16(str)
+ return a + (b * 0x10000), str
+end
+local function dsstr(str)
+ local a, str = dsu32(str)
+ return str:sub(1, a), str:sub(a + 1)
+end
+local function su16(i, wr)
+ wr(string.char(i % 0x100, math.floor(i / 0x100)))
+end
+local function su32(i, wr)
+ su16(i % 0x10000, wr)
+ su16(math.floor(i / 0x10000), wr)
+end
+local function sstr(str, wr)
+ su32(#str, wr)
+ wr(str)
+end
+
+return {
+ new = function ()
+  return {
+   length = 1,
+   height = 1,
+   name = "New Song",
+   transcriptor = "Mr.Anderson",
+   songwriter = "Morpheus",
+   description = "A blank song.",
+   tempo = 200,
+   autosave = 0,
+   autosaveMin = 60,
+   timeSignature = 4,
+   usageMin = 0, usageLeft = 0, usageRight = 0, usageAdd = 0, usageRm = 0,
+   importName = "",
+   ci = "",
+   ticks = {
+    [0] = {
+     [0] = {0, 33}
+    }
+   },
+   layers = {
+    [0] = {"L0", 100}
+   }
+  }
+ end,
+ deserialize = function (str)
+  local nbs = {}
+  nbs.length, str = dsu16(str)
+  nbs.length = nbs.length + 1 -- hmph!
+  nbs.height, str = dsu16(str)
+  nbs.name, str = dsstr(str)
+  nbs.transcriptor, str = dsstr(str)
+  nbs.songwriter, str = dsstr(str)
+  nbs.description, str = dsstr(str)
+  nbs.tempo, str = dsu16(str)
+  nbs.autosave, str = str:byte(), str:sub(2)
+  nbs.autosaveMin, str = str:byte(), str:sub(2)
+  nbs.timeSignature, str = str:byte(), str:sub(2)
+  nbs.usageMin, str = dsu32(str)
+  nbs.usageLeft, str = dsu32(str)
+  nbs.usageRight, str = dsu32(str)
+  nbs.usageAdd, str = dsu32(str)
+  nbs.usageRm, str = dsu32(str)
+  nbs.importName, str = dsstr(str)
+  -- ticks[tick][layer] = key
+  nbs.ticks = {}
+  local tick = -1
+  while true do
+   local ntJ
+   ntJ, str = dsu16(str)
+   if ntJ == 0 then break end
+   tick = tick + ntJ
+   local tickData = {}
+   nbs.ticks[tick] = tickData
+   local layer = -1
+   while true do
+    local lJ
+    lJ, str = dsu16(str)
+    if lJ == 0 then break end
+    layer = layer + lJ
+    local ins = str:byte(1)
+    local key = str:byte(2)
+    str = str:sub(3)
+    local layerData = {ins, key}
+    if layer < nbs.height then
+     tickData[layer] = layerData
+     -- else: drop the invalid note
+    end
+   end
+  end
+  -- nbs.layers[layer] = {name, volume}
+  nbs.layers = {}
+  if str ~= "" then
+   for i = 0, nbs.height - 1 do
+    nbs.layers[i] = {}
+    nbs.layers[i][1], str = dsstr(str)
+    nbs.layers[i][2], str = str:byte(), str:sub(2)
+   end
+  else
+   for i = 0, nbs.height - 1 do
+    nbs.layers[i] = {"L" .. i, 100}
+   end
+  end
+  nbs.ci = str
+  return nbs
+ end,
+ resizeLayers = function (nbs, layers)
+  -- make all layers after target layer go away
+  for i = layers, nbs.height - 1 do
+   nbs.layers[i] = nil
+  end
+  -- add layers up to target
+  for i = nbs.height - 1, layers - 1 do
+   nbs.layers[i] = {"L" .. i, 100}
+  end
+  -- clean up song
+  for k, v in pairs(nbs.ticks) do
+   for lk, lv in pairs(v) do
+    if lk >= layers then
+     v[lk] = nil
+    end
+   end
+  end
+  nbs.height = layers
+ end,
+ -- Corrects length, height (should not be necessary in correct applications!), and clears out unused tick columns.
+ -- Returns the actual effective height, which can be passed to resizeLayers to remove dead weight.
+ correctSongLH = function (nbs)
+  nbs.length = 1
+  nbs.height = 0
+  for k, v in pairs(nbs.layers) do
+   nbs.height = math.max(nbs.height, k + 1)
+  end
+  local eH = 0
+  for k, v in pairs(nbs.ticks) do
+   local ok = false
+   for lk, lv in pairs(v) do
+    ok = true
+    eH = math.max(eH, lk + 1)
+   end
+   if not ok then
+    nbs.ticks[k] = nil
+   else
+    nbs.length = math.max(nbs.length, k + 1)
+   end
+  end
+  return eH
+ end,
+ serialize = function (nbs, wr)
+  su16(math.max(0, nbs.length - 1), wr)
+  su16(nbs.height, wr)
+  sstr(nbs.name, wr)
+  sstr(nbs.transcriptor, wr)
+  sstr(nbs.songwriter, wr)
+  sstr(nbs.description, wr)
+  su16(nbs.tempo, wr)
+  wr(string.char(nbs.autosave, nbs.autosaveMin, nbs.timeSignature))
+  su32(nbs.usageMin, wr)
+  su32(nbs.usageLeft, wr)
+  su32(nbs.usageRight, wr)
+  su32(nbs.usageAdd, wr)
+  su32(nbs.usageRm, wr)
+  sstr(nbs.importName, wr)
+  local ptr = -1
+  for i = 0, nbs.length - 1 do
+   if nbs.ticks[i] then
+    su16(i - ptr, wr)
+    ptr = i
+    local lp = -1
+    for j = 0, nbs.height - 1 do
+     local id = nbs.ticks[i][j]
+     if id then
+      su16(j - lp, wr)
+      lp = j
+      wr(string.char(id[1], id[2]))
+     end
+    end
+    su16(0, wr)
+   end
+  end
+  su16(0, wr)
+  for i = 0, nbs.height - 1 do
+   sstr(nbs.layers[i][1], wr)
+   wr(string.char(nbs.layers[i][2]))
+  end
+  wr(nbs.ci)
+ end
+}