beeeep

local note = require('note')
local computer = require('computer')
local event = require('event')

local oct = {
  [44] = 'C',
  [31] = 'C#',
  [45] = 'D',
  [32] = 'D#',
  [46] = 'E',
  [47] = 'F',
  [34] = 'F#',
  [48] = 'G',
  [35] = 'G#',
  [49] = 'A',
  [50] = 'B'
}

local set, e = 4

print([[
C C# D D# E F F# G G# A B
Z S  X D  C V G  B H  N M
]])

while 1 do
  e = {event.pull('key_down')}
  if e[4] > 2 and e[4] < 7 then
    set = e[4]-1
  else
    if oct[e[4]] then
      computer.beep(note.freq(oct[e[4]]..set), 0.1)
    end
  end
end