A canon generated using algorithmic composition. This means that the music is composed by a computer algorithm. 

You can get some explanation and the full code to the program on my blog: 
http://a-touch-of-music.blogspot.com/2013/08/algorithmic-composition-generating.html
The algorithm used the following inputs:

  # define a chord progression that serves as basis for the canon (change this!)
  chords = "C F Am Dm G C"
  # scale in which to interpret these chords
  scale = music21.scale.MajorScale("C")
  # realize the chords using the given number of voices (e.g. 4)
  voices = 5
  # realize the chords in octave 4 (e.g. 4)
  octave = 4
  # realize the chords using half notes (e.g. 1 for a whole note)
  quarterLength = 2
  # number of times to spice-up the streams (e.g. 2)
  spice_depth = 1
  # how many instances of the same chords to stack (e.g. 2)
  stacking = 1
  # define extra transpositions for different voices (e.g. +12, -24, ...)
  # note that the currently implemented method only gives good results with multiples of 12
  voice_transpositions = { VOICE1 : 0, VOICE2 : 0, VOICE3 : -12, VOICE4: -24, VOICE5: -12 }

Algorithmically generated canon

stefaanhimpe