I've just seen the following video
and I wondered how hard it was to automatically generate this myself only with software. Turns out, it is super easy.
You have to install
$ sudo pip install MIDIUtil
and then you can execute the following code:
#!/usr/bin/env python from midiutil.MidiFile import MIDIFile # Just an example try: # import version included with old SymPy from sympy.mpmath import mp except ImportError: # import newer version from mpmath import mp mp.dps = 1000 # set number of digits # Create the MIDIFile Object with 1 track MyMIDI = MIDIFile(1) track = 0 channel = 0 pitch = 60 time = 0 duration = 1 volume = 100 for digit in str(mp.pi): if digit == '.': continue MyMIDI.addNote(track, channel, pitch + int(digit), time, duration, volume) time += 1 if time == 180: break # And write it to disk. binfile = open("output.mid", 'wb') MyMIDI.writeFile(binfile) binfile.close()
This will make the first 180 digits of \(\pi\) to a MIDI file.
See MIDIUtil docs for more information.
timidity to create a
.wav and then
lame to convert it to mp3:
$ timidity -Ow -o output.wav output.mid $ lame output.wav pi.mp3
For YouTube, I had to convert it to avi:
$ ffmpeg -loop 1 -r 1 -i pi.jpg -i pi.mp3 -c:a copy -shortest pi.avi
It sounds much more intersting if you play two versions of it simultaneously, starting at different points:
You could reserve one digit for meta-choices, e.g. making 0 a control character. If 0 is followed by...
- ... 0, all modifiers are reset
- ... 1, the pitch is doubled all the time
- ... 2, the pitch is doubled for 10 notes
- ... 3, `time = time - 5.5`
- ... 4, `tempo = tempo*2`
- ... 5, `tempo = tempo*4
- ... 6, `tempo = tempo - 10
- ... 7, volume increases in as many beats as the next two digits indicate
- ... 8, volume decreases by 10 in the next 2 seconds
- ... 9, duration is doubled
Let me know if you made something that sounds interesting :-)