Home : Tune Toys : Expresso 
  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:
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Phrase for X:
# of Tracks:
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After 19 generations the expression "X" became this:
transpose(echo((((((echo(transpose((echo(shuffle((X|(((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(X) ) ) ) ,4,6) +transpose(step(shuffle(((X+X) |transpose(X,-5) ) ) ,12) ,7) ) ,-5) ,4,6) +transpose((arpeggio((transpose(shuffle(shuffle(X) ) ,-7) +arpeggio(X) ) ) +transpose(shuffle(transpose(arpeggio(X) ,-5) ) ,4) ) ,4) ) +transpose((echo(((shuffle(shuffle((transpose((X+transpose(X,12) ) ,-5) +transpose((transpose(X,-5) +transpose((X|X) ,12) ) ,7) ) ) ) +transpose((((transpose(X,-7) +transpose((shuffle(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose((transpose(X,-5) +transpose((X+X) ,-7) ) ,7) ) +transpose(echo((echo(X,4,6) |X) ,4,6) ,7) ) ,4) ) +transpose(echo(arpeggio(transpose(transpose(arpeggio(X) ,4) ,4) ) ,4,6) ,7) ) ,4,6) +transpose(shuffle(transpose(transpose(echo(arpeggio(X) ,4,6) ,-7) ,-7) ) ,7) ) ,7) ) +transpose(((shuffle(X) +transpose(((((((X+transpose(transpose(X,4) ,7) ) +transpose(transpose((X+transpose(shuffle(X) ,7) ) ,4) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ) ,4) ) +transpose((shuffle((X+X) ) +transpose(transpose(X,-7) ,12) ) ,7) ) ,12) ) +shuffle((((((((arpeggio(X) +transpose((X+X) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(X,4) ,4) ) +transpose((X+transpose((X+X) ,12) ) ,7) ) +transpose((step(X,12) +X) ,4) ) +transpose((((X+transpose(X,12) ) |X) |transpose((X+transpose(X,7) ) ,4) ) ,7) ) +transpose(((shuffle(X) |arpeggio(X) ) +shuffle((X+transpose((X|X) ,12) ) ) ) ,4) ) ) ) ,12) ) +shuffle(((arpeggio(((((transpose(shuffle(transpose(echo(X,4,6) ,4) ) ,4) +transpose(echo(X,4,6) ,12) ) +((transpose(transpose(X,-5) ,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |((transpose(transpose(transpose(X,-7) ,-7) ,4) +transpose(((X+transpose(X,7) ) +((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4) ) +transpose(step(shuffle((X|X) ) ,12) ,7) ) ) ) +transpose((transpose(arpeggio(X) ,-5) |((transpose(X,4) +transpose(transpose(X,-7) ,7) ) |(X|X) ) ) ,7) ) +transpose(((transpose(((shuffle((X+transpose(X,12) ) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,-5) +transpose((step(transpose((X+transpose(echo(X,4,6) ,12) ) ,4) ,12) |shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ) ,-7) ,7) ) ) ) ,4) ) +transpose((step(shuffle(arpeggio((X|shuffle(X) ) ) ) ,12) +transpose((((((((X+transpose(shuffle(X) ,4) ) +transpose(shuffle(X) ,7) ) |shuffle(shuffle(X) ) ) +transpose((transpose(X,-5) |transpose((X+transpose(X,7) ) ,4) ) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ,7) ) +transpose((shuffle(X) |X) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) ,12) ) ,7) ) ,7) ) ) +transpose(transpose((transpose(transpose(transpose(arpeggio(X) ,4) ,4) ,4) |(transpose(((X+step(X,12) ) |(step(X,12) +transpose((X+X) ,12) ) ) ,-5) +transpose((arpeggio(arpeggio(shuffle(X) ) ) +transpose((transpose(X,-7) +transpose(transpose(shuffle((transpose(X,-7) +X) ) ,4) ,7) ) ,7) ) ,12) ) ) ,4) ,7) ) +transpose(transpose(step(transpose((((echo(X,4,6) +(X+transpose(X,7) ) ) +(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(shuffle(X) ,7) ) ) +shuffle((X+X) ) ) ,-7) ,12) ,-5) ,-7) ) ) ) +transpose(((echo((((echo((shuffle(((X+X) +shuffle(X) ) ) |(transpose(X,-5) +transpose(X,7) ) ) ,4,6) |((transpose(transpose(transpose((X|X) ,-7) ,-5) ,4) +transpose((shuffle(X) +transpose(X,7) ) ,4) ) +transpose(arpeggio(transpose(shuffle(transpose(X,-7) ) ,-5) ) ,7) ) ) +transpose((transpose((X+transpose(X,7) ) ,4) +(step(X,12) |transpose(X,-5) ) ) ,4) ) +transpose(shuffle(transpose(transpose(((echo(((X+transpose(X,12) ) +step(X,12) ) ,4,6) |((X|X) +(X|X) ) ) |(transpose((X+transpose(X,12) ) ,4) +transpose(transpose(X,4) ,7) ) ) ,4) ,-7) ) ,7) ) ,4,6) +transpose((transpose(transpose(((step(X,12) +(X|X) ) +shuffle(echo(X,4,6) ) ) ,-7) ,-7) |transpose((step(transpose((transpose((X+X) ,-7) +transpose((X+transpose(X,7) ) ,7) ) ,-7) ,12) +(((step((X|X) ,12) +transpose((X|X) ,4) ) +transpose(transpose(X,-5) ,7) ) |arpeggio(echo((((transpose(X,-5) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) +X) ,4,6) ) ) ) ,-7) ) ,12) ) |transpose(transpose(transpose((((step(transpose(echo((((X+X) +transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ,-5) ,12) +shuffle(echo(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ) ) |X) |(arpeggio(shuffle(transpose(X,4) ) ) +transpose(((transpose(X,-5) +transpose(((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(((X+(X|X) ) +transpose(transpose(shuffle(X) ,-5) ,12) ) ,7) ) ,12) ) ) ,4) ,-5) ,4) ) ,12) ) ,4,6) ,-5)
random seed used was 4 EXPR = transpose(((echo(transpose((transpose((((shuffle(transpose(X,-5) ) +((transpose(arpeggio((X|echo(X,4,6) ) ) ,-7) +transpose((step((X+transpose(shuffle(X) ,12) ) ,12) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) ,4) ) +transpose(((transpose(transpose(X,-5) ,-5) |((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose(echo(X,4,6) ,7) ) ) +(shuffle(shuffle(X) ) +(echo(arpeggio(X) ,4,6) +transpose(step(X,12) ,7) ) ) ) ,7) ) ) |shuffle(((transpose((X+transpose(X,12) ) ,-5) +transpose((((((X+X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,12) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ,12) ) ) ) |(transpose(arpeggio(((arpeggio((X+transpose(X,7) ) ) +step(shuffle(transpose(X,-7) ) ,12) ) |((transpose(transpose(transpose(X,-5) ,-5) ,-5) +arpeggio((X+transpose(X,7) ) ) ) +transpose(step(((shuffle(X) +transpose((X+transpose(X,-7) ) ,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) ,12) ,7) ) ) ) ,-5) +transpose(((step((transpose(((X+X) |((X+X) +X) ) ,-5) +echo(echo(X,4,6) ,4,6) ) ,12) +transpose((transpose(X,4) +transpose(transpose((shuffle(X) +X) ,-5) ,12) ) ,7) ) +transpose(transpose(transpose((transpose(transpose(shuffle(transpose(transpose(X,-5) ,4) ) ,-5) ,-7) +transpose(shuffle(shuffle(step(transpose(transpose(X,4) ,-7) ,12) ) ) ,12) ) ,4) ,-7) ,7) ) ,7) ) ) ,-5) +(shuffle((step((echo(((((X|X) +transpose(X,7) ) +transpose(((step((X+X) ,12) +transpose((X+transpose(transpose(X,-5) ,12) ) ,4) ) +transpose((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,4) ) +transpose((transpose(X,-7) +transpose((X|X) ,7) ) ,7) ) ,4,6) +((transpose(X,-7) +echo(X,4,6) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) ) ) ,12) +arpeggio(transpose(transpose((step(transpose(X,-5) ,12) +transpose(echo(transpose((echo(step(X,12) ,4,6) +((arpeggio(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4) ,4,6) ,7) ) ,-5) ,-7) ) ) ) +transpose((((transpose(transpose(step(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |step(shuffle(transpose(X,-5) ) ,12) ) +transpose((transpose(shuffle(X) ,4) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,12) ) ,12) ,4) ,-7) +transpose(transpose(shuffle((((step(arpeggio(X) ,12) +transpose((step((X+transpose(X,12) ) ,12) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(step((echo(X,4,6) +(X+transpose(X,7) ) ) ,12) ,7) ) +transpose((shuffle(X) +transpose(transpose(X,4) ,7) ) ,7) ) ) ,-5) ,4) ) +transpose(transpose(transpose((((X+X) |X) |((echo(X,4,6) +transpose(transpose(shuffle(X) ,-7) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ) ,-5) ,-5) ,7) ) +arpeggio(arpeggio(((arpeggio(shuffle(X) ) |((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +echo(((transpose(X,4) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,4,6) ) ) ) ) ,7) ) ) ,4) ,4,6) +transpose(((shuffle(step((shuffle((((transpose(X,-5) |shuffle((X+transpose(X,12) ) ) ) +transpose((shuffle((echo(X,4,6) |X) ) +transpose(shuffle((shuffle(X) +(X|X) ) ) ,12) ) ,7) ) +transpose(((((X|X) +transpose(X,4) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,-5) ,7) ) ,7) ) ) +transpose((((shuffle(arpeggio((X+X) ) ) +transpose((echo((X|X) ,4,6) +transpose(transpose(transpose(X,4) ,4) ,12) ) ,12) ) +transpose(transpose(X,-7) ,12) ) |shuffle(echo(transpose(X,-5) ,4,6) ) ) ,7) ) ,12) ) +transpose((transpose(((((transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) +transpose(arpeggio(transpose(X,4) ) ,12) ) +transpose(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(shuffle(X) ,12) ) ,-5) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) |(shuffle(transpose(arpeggio(X) ,4) ) +(transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) ,-7) |(shuffle(arpeggio(X) ) +shuffle(X) ) ) ) ) ,-5) +transpose(transpose(arpeggio((shuffle((((X|X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ) +transpose(transpose(step(((transpose(X,4) +transpose(X,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ,12) ,4) ,12) ) ) ,-7) ,7) ) ,-7) ) +transpose(transpose(transpose(arpeggio(shuffle((X+transpose(X,7) ) ) ) ,-7) ,4) ,12) ) ,4) ) +transpose(transpose((transpose(echo(transpose(((shuffle(X) +(X+transpose((X+transpose(X,7) ) ,7) ) ) +(((transpose(shuffle(transpose((X+transpose(X,7) ) ,4) ) ,-7) +transpose(shuffle((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) |X) ) ,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) +transpose(((transpose(X,-5) +transpose((((X+transpose(X,12) ) +transpose(X,12) ) |(transpose(step(X,12) ,4) +shuffle(X) ) ) ,4) ) +transpose((((transpose(X,4) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) +echo((X|X) ,4,6) ) ,7) ) ,-7) ) ) ,4) ,4,6) ,4) +echo(transpose(((transpose(arpeggio(transpose(X,4) ) ,4) +transpose(transpose(step(transpose(transpose(X,4) ,-7) ,12) ,-7) ,4) ) +transpose(transpose(transpose(transpose(transpose(X,4) ,4) ,-7) ,-5) ,7) ) ,-5) ,4,6) ) ,4) ,7) ) ,-7)
random seed used was 0

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