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Expresso takes a simple musical expression (literally "X") and mutates it. In each generation, transformations are applied to components of the expression. This is a fractal technique known as an L-system. The more generations there are, the larger and more complex the expression gets (and the longer it can take to compute). The output varies wildly, from boring to fascinating. Press "Mutate" a few times till you get something that looks interesting, then click on the image to play it. See Composer's Quarry for examples of output.

Transformations:
 Seed: Randomize seed: Generations: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Phrase for X: Basic 1 - c,e,gBasic 2 - c,g,e,b-Basic 3 - c,gBasic 4 - cBasic 5 - co3,co4,co3,co2Chord 1 - c e gChord 2 - c e- gChord 3 - c e- g b-Chord 4 - c f gFile 1 - bachinv1.midFile 2 - bachinv2.midFile 3 - bachinv3.midFile 4 - bachinv4.midFile 5 - bachinv5.midFile 6 - bachinv6.midFile 7 - bachinv7.midFile 8 - bachinv8.mid # of Tracks: 1234 Randomize patches: noyes Results may not appear for a few seconds.Be patient!
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 After 17 generations the expression "X" became this: (transpose(((arpeggio(((((transpose(((X|X) |(X+transpose(X,7) ) ) ,-5) +transpose(step(X,12) ,7) ) |(arpeggio(arpeggio(X) ) +shuffle(X) ) ) +transpose(((arpeggio(step(X,12) ) +transpose((((shuffle(X) +arpeggio(X) ) +transpose(X,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ,7) ) +(arpeggio(X) |transpose(X,-5) ) ) ,7) ) |transpose(transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,4) ,-7) ) ) +transpose((transpose(arpeggio(arpeggio(shuffle(shuffle(transpose(step(arpeggio(X) ,12) ,-7) ) ) ) ) ,-7) +transpose(((step(shuffle(transpose(transpose(X,-7) ,4) ) ,12) |shuffle((arpeggio(transpose(X,4) ) +transpose((shuffle(transpose(X,-7) ) |step(X,12) ) ,7) ) ) ) +transpose(((((((arpeggio(X) +transpose(step(transpose((X+transpose(X,12) ) ,4) ,12) ,4) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) +arpeggio(arpeggio(X) ) ) +transpose((X|X) ,4) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) +transpose(((arpeggio(arpeggio(X) ) +(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ) |transpose(step(X,12) ,4) ) ,12) ) ,7) ) ,7) ) ,4) ) +transpose(((transpose(transpose(arpeggio(shuffle(X) ) ,4) ,4) +shuffle(step(transpose(((((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,12) ) +(X+transpose(X,7) ) ) ,-7) ,12) ) ) +arpeggio(((shuffle(arpeggio(X) ) +transpose(transpose(echo(step(X,12) ,4,6) ,4) ,-5) ) +transpose(step(transpose(shuffle(X) ,-5) ,12) ,7) ) ) ) ,7) ) ,-7) +arpeggio(shuffle(arpeggio(step(transpose(step(((transpose(echo(arpeggio(X) ,4,6) ,4) +transpose(((step(transpose(X,-5) ,12) +transpose((transpose(X,-5) |X) ,7) ) +transpose(((echo(arpeggio(X) ,4,6) +transpose((transpose(X,4) |X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,7) ) +arpeggio(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,12) ,4) ,12) ) ) ) ) random seed used was 996633 EXPR = ((transpose(step(shuffle(step((((shuffle(step(arpeggio(shuffle(X) ) ,12) ) +transpose((transpose((X|transpose(X,-5) ) ,4) |(transpose((X+transpose(X,12) ) ,4) +arpeggio(transpose(X,4) ) ) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(transpose(arpeggio(X) ,-5) |(X+X) ) ) ,7) ) +transpose(transpose(step(echo(transpose((shuffle((X+transpose(X,12) ) ) |X) ,-5) ,4,6) ,12) ,4) ,7) ) ,12) ) ,12) ,-5) +transpose((transpose(transpose(step(step(((step(arpeggio(X) ,12) |(transpose(X,4) |shuffle(X) ) ) +transpose(step(step(arpeggio(X) ,12) ,12) ,7) ) ,12) ,12) ,-5) ,-5) |shuffle((arpeggio((shuffle(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) |step((transpose(shuffle(X) ,-5) +transpose(shuffle(X) ,12) ) ,12) ) +step(transpose(((X|X) |(X+X) ) ,-7) ,12) ) ) +step((transpose((X+X) ,-7) |X) ,12) ) ) +transpose(shuffle((((transpose(shuffle((shuffle(step(X,12) ) |(shuffle(X) +transpose(shuffle(X) ,7) ) ) ) ,-7) +transpose(shuffle(X) ,7) ) +transpose((shuffle(X) +(X+transpose(X,7) ) ) ,4) ) +transpose((transpose(step(X,12) ,-5) +(((transpose(X,-5) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ) +((transpose((X+transpose(X,7) ) ,4) |X) +transpose(X,4) ) ) +step(step(echo(echo(X,4,6) ,4,6) ,12) ,12) ) ) ,7) ) ) ,12) ) ) ) ,7) ) +transpose((shuffle((step((transpose(arpeggio(arpeggio(X) ) ,-7) |transpose(arpeggio((transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) ) ,-5) ) ,12) +(transpose(((transpose(step(X,12) ,-7) +step(shuffle(transpose(X,-5) ) ,12) ) +transpose(arpeggio(step(((shuffle(step(X,12) ) +transpose(echo((arpeggio(X) |X) ,4,6) ,4) ) +transpose(transpose(transpose(step(X,12) ,4) ,-7) ,7) ) ,12) ) ,4) ) ,-7) |arpeggio(arpeggio(step((arpeggio(((((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((X+transpose(((X+X) +X) ,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ) |((X+transpose(X,12) ) +((arpeggio(X) +(X+transpose(arpeggio(X) ,12) ) ) |step(arpeggio(X) ,12) ) ) ) ,12) ) ) ) ) ) |shuffle(transpose(((shuffle((transpose(transpose(X,-5) ,-7) |shuffle((shuffle(step((X+transpose(X,12) ) ,12) ) +((step((X+X) ,12) +transpose(step(X,12) ,4) ) +transpose(((X|X) +X) ,7) ) ) ) ) ) |transpose(transpose(shuffle(((((X+transpose(step(X,12) ,12) ) +transpose((transpose(step(X,12) ,-5) |transpose(X,-7) ) ,4) ) +transpose((((X+transpose(echo(X,4,6) ,4) ) +transpose(echo(step(X,12) ,4,6) ,4) ) +transpose(transpose(transpose(arpeggio(step(X,12) ) ,-5) ,-5) ,7) ) ,4) ) +transpose(X,7) ) ) ,4) ,4) ) +((((shuffle((transpose(((transpose(((step(X,12) +transpose(step(X,12) ,-7) ) +transpose(step(arpeggio(X) ,12) ,7) ) ,4) +transpose(shuffle(echo(X,4,6) ) ,4) ) +transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +(X+transpose(step(X,12) ,12) ) ) +transpose((transpose(shuffle(X) ,-7) +transpose(arpeggio(transpose(X,4) ) ,12) ) ,12) ) ,7) ) ,4) +transpose((echo(transpose(shuffle(arpeggio(X) ) ,-5) ,4,6) |(transpose(transpose(((transpose(X,4) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,-5) ,4) +transpose(shuffle((arpeggio(X) +transpose((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) ,7) ) ) ,12) ) ) ,7) ) ) +transpose((shuffle(((X+transpose(shuffle(arpeggio((transpose((X+transpose(X,7) ) ,-5) |shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ) ,7) ) +transpose(transpose(echo((arpeggio(shuffle(X) ) +transpose(arpeggio(X) ,12) ) ,4,6) ,4) ,7) ) ) |((((shuffle(arpeggio(arpeggio(echo((X+X) ,4,6) ) ) ) +transpose(step((X|X) ,12) ,4) ) +transpose(step(X,12) ,7) ) +transpose(step((transpose(step(X,12) ,4) +transpose(((arpeggio((X|X) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) +transpose(X,7) ) ,12) ) ,12) ,7) ) |(echo((arpeggio(arpeggio(X) ) +transpose((transpose((X+X) ,-7) +echo(X,4,6) ) ,7) ) ,4,6) |shuffle((transpose(step((X+X) ,12) ,-5) +transpose((((X+X) +transpose(echo(X,4,6) ,7) ) +step(echo(X,4,6) ,12) ) ,-5) ) ) ) ) ) ,4) ) +transpose((echo((((transpose(arpeggio(step(X,12) ) ,-7) +transpose(shuffle(step(arpeggio((X+X) ) ,12) ) ,12) ) +transpose(shuffle(echo(shuffle(X) ,4,6) ) ,7) ) +transpose(transpose((transpose(transpose(X,4) ,-7) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) ,-7) ,4) ) ,4,6) +transpose((transpose((transpose(transpose(X,4) ,4) +transpose(transpose((X|X) ,-5) ,7) ) ,4) +((arpeggio(arpeggio(echo(step(X,12) ,4,6) ) ) +transpose((shuffle(X) |echo(transpose(X,4) ,4,6) ) ,12) ) |arpeggio(transpose(transpose(X,4) ,4) ) ) ) ,12) ) ,7) ) +transpose(transpose(arpeggio(echo(transpose(arpeggio(shuffle(transpose(X,4) ) ) ,-5) ,4,6) ) ,-5) ,4) ) +transpose(((echo(transpose(arpeggio(step(X,12) ) ,-5) ,4,6) +transpose((((X|X) +(X+transpose(X,7) ) ) |(shuffle(step(X,12) ) +transpose(((X+transpose(X,12) ) |arpeggio(X) ) ,12) ) ) ,-5) ) +transpose(echo(arpeggio(arpeggio((arpeggio(X) |shuffle(X) ) ) ) ,4,6) ,4) ) ,7) ) ) ,4) ) ) ,7) ) random seed used was 0 EXPR = (arpeggio(step(((arpeggio(step(((arpeggio((transpose((X+echo(X,4,6) ) ,4) +transpose((shuffle(X) +(step(X,12) +transpose(step(((X+X) +X) ,12) ,7) ) ) ,7) ) ) +transpose(transpose(transpose(arpeggio((echo(step(step(X,12) ,12) ,4,6) +arpeggio(X) ) ) ,4) ,-5) ,4) ) +transpose(arpeggio(((transpose((X+X) ,4) +transpose(shuffle((X+transpose(step(X,12) ,12) ) ) ,4) ) +transpose((shuffle(X) +(X|X) ) ,7) ) ) ,7) ) ,12) ) +transpose(transpose(transpose(shuffle(shuffle(X) ) ,-7) ,-5) ,4) ) +transpose(transpose(((arpeggio((transpose((transpose(arpeggio(X) ,4) +transpose((X|X) ,-7) ) ,4) |(((transpose((arpeggio(X) +transpose(echo(arpeggio(X) ,4,6) ,12) ) ,4) +transpose(shuffle((X+X) ) ,4) ) +transpose(shuffle(transpose(arpeggio(X) ,-5) ) ,7) ) +transpose(shuffle(transpose(X,-7) ) ,12) ) ) ) +transpose((transpose(step(transpose(shuffle(transpose(X,-7) ) ,-5) ,12) ,-7) |shuffle((arpeggio(transpose((X|X) ,-5) ) +((shuffle(X) |X) +step(echo(X,4,6) ,12) ) ) ) ) ,4) ) +transpose(transpose(transpose(((transpose(X,-5) |shuffle((X+X) ) ) |(X+transpose((X+X) ,12) ) ) ,-5) ,-7) ,7) ) ,-5) ,7) ) ,12) ) |step(transpose(transpose(step(step((arpeggio((transpose(step(transpose(echo(X,4,6) ,4) ,12) ,-5) +transpose((X+shuffle((X|X) ) ) ,4) ) ) |transpose(((step(step((X+X) ,12) ,12) +transpose(echo((transpose(X,4) +(X+transpose(X,12) ) ) ,4,6) ,12) ) +transpose(transpose((X|X) ,-5) ,7) ) ,-5) ) ,12) ,12) ,-5) ,-7) ,12) ) random seed used was 0

The algorithm for Expresso is written in KeyKit, and here's the source code.