local aukit = require "aukit"
-- assume we stored the song in "wxp.wav"

-- read the data
local file = fs.open("wxp.wav", "rb") -- read binary mode is important.
if not file then
  error("Music file doesn't exist.", 0)
end
local data = file.readAll() -- actually read data
file.close() -- important to close file handles.

-- Now, for aukit stuff.
local iterator, length = aukit.stream.wav(data)
aukit.play(
  iterator,
  function(pos)
    -- do something with the current position
    -- Do not infinite loop in this function!
  end,
  1, -- audio volume
  peripheral.find("speaker") -- speakers to play the audio on, in this case all speakers
)