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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After 20 generations the expression "X" became this:
((((transpose(transpose((transpose(transpose(transpose(transpose(((transpose(((X+transpose(X,-5) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose((echo(X,4,6) +transpose((transpose(X,-5) +(X|X) ) ,-5) ) ,4) ) +transpose((transpose(X,4) +transpose((X|X) ,12) ) ,7) ) ,-5) ,-7) ,-5) ,4) +arpeggio((((transpose(transpose((((X+step(X,12) ) +transpose(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ,4) ) +transpose(((shuffle((X|X) ) +transpose(X,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ,7) ) ,-5) ,-5) +transpose(arpeggio((transpose(arpeggio(echo((X|transpose(X,-7) ) ,4,6) ) ,-5) |transpose((((X+transpose(X,12) ) +transpose(step(X,12) ,7) ) +((X|X) +transpose((X+transpose(X,12) ) ,7) ) ) ,-5) ) ) ,12) ) +transpose(echo((transpose(shuffle(X) ,4) +(transpose(X,-7) +transpose(X,7) ) ) ,4,6) ,12) ) +transpose(transpose((arpeggio((echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) ,4,6) |transpose(X,-5) ) ) +transpose(((transpose((transpose(transpose(X,-7) ,4) +(transpose(X,-7) +(X+transpose(X,12) ) ) ) ,4) +transpose((echo(transpose((X+transpose(X,7) ) ,-5) ,4,6) +(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ) ,4) ) +transpose((transpose((X|X) ,4) |(transpose(step(transpose(X,4) ,12) ,-5) |arpeggio((X|X) ) ) ) ,7) ) ,7) ) ,-5) ,7) ) ) ) ,4) ,-5) |((transpose(transpose(transpose(shuffle(transpose(((X+transpose(X,12) ) |X) ,-5) ) ,4) ,-5) ,4) +transpose((transpose((transpose(transpose((transpose(arpeggio((X+transpose(arpeggio(X) ,7) ) ) ,4) +step(transpose(shuffle((X+transpose(X,7) ) ) ,-5) ,12) ) ,-7) ,-5) |echo(transpose(((echo(X,4,6) +transpose(X,12) ) +transpose(echo(X,4,6) ,12) ) ,-7) ,4,6) ) ,-5) +transpose((transpose((transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,-5) +step((X|transpose(X,-5) ) ,12) ) ,-5) +transpose((transpose((step(transpose(arpeggio((X+X) ) ,4) ,12) |transpose(transpose(transpose(echo(X,4,6) ,-7) ,4) ,-5) ) ,4) +shuffle(arpeggio((((X|X) +transpose(((echo(step(X,12) ,4,6) +transpose((transpose(X,-7) +X) ,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(transpose((X|(X|X) ) ,-5) ,7) ) ) ) ) ,7) ) ,-5) ) ,7) ) +transpose((transpose(transpose(transpose(transpose(echo(step(transpose(step(X,12) ,-7) ,12) ,4,6) ,4) ,-7) ,4) ,4) +transpose(transpose((((transpose((transpose((transpose(X,-7) |transpose(X,4) ) ,-5) +transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,12) ) ,4) |(((X|X) |(shuffle(X) +arpeggio(X) ) ) +(((transpose((X+X) ,-7) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ) ) +transpose((X+(echo(transpose(X,-5) ,4,6) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,4) ) +transpose(arpeggio(shuffle(transpose(transpose(X,4) ,-7) ) ) ,7) ) ,-7) ,-5) ) ,7) ) ) +transpose(((transpose(transpose(transpose(transpose((((((X+transpose(X,7) ) +transpose((X+(X+X) ) ,12) ) +echo((X|X) ,4,6) ) +transpose(((((X+transpose((X|X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(shuffle(X) ,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(transpose(((arpeggio(step((X|X) ,12) ) +transpose(transpose(((X+transpose(X,12) ) |X) ,4) ,4) ) +transpose((transpose(transpose((X+X) ,-5) ,-7) +transpose(transpose(X,4) ,7) ) ,7) ) ,-5) ,7) ) ,-5) ,-5) ,4) ,-5) +transpose(((transpose((((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((X+transpose(X,12) ) |transpose(X,4) ) ,12) ) ,4) |transpose(((((transpose(X,-5) +X) +transpose((transpose(step(arpeggio((X+X) ) ,12) ,-7) +transpose(shuffle((X|transpose(X,-5) ) ) ,7) ) ,12) ) +transpose((transpose(transpose(transpose(arpeggio(echo(X,4,6) ) ,4) ,-5) ,-5) +transpose((X|X) ,12) ) ,4) ) +transpose(transpose(arpeggio(echo(((transpose(echo(X,4,6) ,-7) |transpose((X|X) ,4) ) +transpose(step(transpose(transpose(X,-7) ,4) ,12) ,12) ) ,4,6) ) ,4) ,7) ) ,-5) ) |transpose((((((arpeggio((((X+transpose(transpose(X,-7) ,-7) ) +transpose(transpose(shuffle((X+transpose(X,7) ) ) ,-7) ,7) ) +transpose(((((arpeggio(X) +X) +transpose(shuffle(transpose(X,-7) ) ,4) ) +transpose((X+X) ,7) ) |X) ,12) ) ) +(step((((X+X) +X) +transpose((X+(X+transpose(X,7) ) ) ,7) ) ,12) +transpose(((transpose((X|X) ,-7) +transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) ) +transpose((arpeggio(((X+transpose(X,7) ) +shuffle(X) ) ) +transpose(X,12) ) ,4) ) +transpose((transpose(((transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) ,4) +transpose(transpose(transpose((X+X) ,4) ,-5) ,4) ) +transpose(((X+transpose(shuffle(X) ,12) ) |arpeggio(((X+X) +step(transpose(X,-7) ,12) ) ) ) ,7) ) ,-7) |echo(echo((transpose(X,-5) +transpose(step(X,12) ,12) ) ,4,6) ,4,6) ) ,7) ) +transpose(step(arpeggio((((arpeggio(step(transpose(X,-7) ,12) ) +transpose((transpose((transpose(X,-5) +transpose(X,7) ) ,-7) |X) ,4) ) +transpose((X+step(X,12) ) ,7) ) +echo(transpose(X,-7) ,4,6) ) ) ,12) ,4) ) +transpose(((transpose(step(echo(X,4,6) ,12) ,-5) +transpose(transpose(echo(transpose(step(transpose(X,4) ,12) ,4) ,4,6) ,4) ,4) ) +transpose(echo(arpeggio((transpose((X|transpose(shuffle(X) ,-7) ) ,4) |transpose(((shuffle(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X|X) ,7) ) ,-7) ) ) ,4,6) ,7) ) ,7) ) ,-7) ) ,12) ) |(transpose(transpose(transpose((transpose(transpose((echo(((arpeggio(transpose(X,4) ) +transpose(transpose(arpeggio(X) ,-7) ,12) ) |shuffle(echo(transpose(X,-7) ,4,6) ) ) ,4,6) |((X+transpose((X|X) ,12) ) +transpose(X,12) ) ) ,-5) ,4) +transpose(transpose((((step((X+transpose(X,-5) ) ,12) |transpose(step(X,12) ,4) ) |arpeggio(transpose(echo(X,4,6) ,4) ) ) +((((transpose(X,-5) +transpose(transpose(X,4) ,4) ) +transpose(((X|X) +step(transpose(X,-5) ,12) ) ,7) ) +transpose(transpose((X|transpose((X+X) ,4) ) ,-5) ,4) ) +transpose(transpose((X+(X|X) ) ,-7) ,7) ) ) ,4) ,12) ) ,-5) ,-7) ,-5) +transpose(((shuffle(echo((arpeggio(transpose(((X+transpose(X,12) ) |transpose(X,4) ) ,-7) ) +transpose(transpose(transpose(echo((X|X) ,4,6) ,4) ,4) ,4) ) ,4,6) ) |transpose(((((transpose((arpeggio((X+X) ) |arpeggio(X) ) ,-5) +transpose(transpose(X,-7) ,12) ) +((X+transpose(X,12) ) |transpose(shuffle(X) ,4) ) ) +(transpose(transpose(step((arpeggio(X) +transpose((X+transpose(X,7) ) ,12) ) ,12) ,-7) ,-7) +transpose(transpose((X+(X|X) ) ,4) ,12) ) ) +arpeggio(((echo((X+X) ,4,6) +X) +shuffle(((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose((shuffle(X) +X) ,7) ) ) ) ) ) ,4) ) +transpose(transpose((transpose(transpose((transpose(X,4) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ,-7) ,4) +transpose(((transpose(arpeggio(step(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,4) +transpose((transpose(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +(transpose(X,-7) +((X+transpose(X,7) ) +transpose(X,12) ) ) ) ,-5) ,-7) |((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) |(X+X) ) +transpose(shuffle(X) ,-5) ) ) ,4) ) +transpose(transpose(transpose(transpose((X+X) ,-7) ,4) ,-5) ,7) ) ,12) ) ,-5) ,12) ) ,4) ) ) ,7) ) +transpose(echo((transpose(transpose((step(echo((((((((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose((shuffle(X) +transpose(X,12) ) ,7) ) |transpose((X+transpose(X,7) ) ,-7) ) +transpose(transpose(X,-5) ,-5) ) |transpose(arpeggio(echo((X+transpose(transpose(X,-7) ,7) ) ,4,6) ) ,4) ) +transpose(transpose((arpeggio(X) +transpose(transpose(arpeggio(transpose((X+X) ,4) ) ,-7) ,7) ) ,-5) ,7) ) ,4,6) ,12) +transpose((transpose(transpose(transpose(transpose(arpeggio(X) ,-7) ,-7) ,-7) ,-7) |transpose((arpeggio((((X+transpose(X,12) ) +transpose(arpeggio(X) ,7) ) +X) ) +(((step(X,12) +transpose((X+transpose(X,12) ) ,7) ) |transpose((((X|X) +transpose(transpose(X,-5) ,7) ) +arpeggio((X+transpose(X,12) ) ) ) ,-5) ) +(transpose(X,-7) +transpose(transpose(X,-7) ,12) ) ) ) ,-5) ) ,7) ) ,-5) ,4) +transpose(transpose(echo((transpose(echo(((transpose((X+transpose(X,7) ) ,4) +transpose(shuffle((transpose(X,-5) +transpose((X|X) ,7) ) ) ,12) ) +transpose((shuffle(transpose(transpose(transpose(X,4) ,-7) ,-5) ) +transpose(((step(X,12) +transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose((X+X) ,7) ) ,-7) ) ,7) ) ,4,6) ,-7) +transpose((transpose((transpose(X,-5) +step((X+transpose(X,7) ) ,12) ) ,-7) +transpose((arpeggio((((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) |((X+X) |X) ) ,12) ) ,4) ) ,4,6) ,-5) ,12) ) ,4,6) ,12) ) +transpose((((transpose(transpose(transpose(echo(echo(transpose((X+transpose(X,4) ) ,4) ,4,6) ,4,6) ,-7) ,-7) ,4) +((step(transpose((step((X+transpose(X,7) ) ,12) +(step(X,12) |(X+X) ) ) ,-5) ,12) |transpose(step((((transpose(X,-7) +transpose(transpose(X,-7) ,12) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) |(transpose(((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) |step((transpose(X,-5) +transpose(X,12) ) ,12) ) ) ,12) ,4) ) |(arpeggio(echo(((X|(X|X) ) |(((X+transpose(X,12) ) +transpose((X|X) ,7) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ) ,4,6) ) +echo(transpose(echo((step((transpose(X,4) +shuffle(X) ) ,12) +transpose(((((X+X) +(X|X) ) +transpose(((X+X) +transpose(X,12) ) ,7) ) +transpose((X+X) ,7) ) ,12) ) ,4,6) ,4) ,4,6) ) ) ) +transpose(transpose(transpose(transpose(echo(shuffle(echo(transpose(transpose(transpose(arpeggio(X) ,-5) ,4) ,-5) ,4,6) ) ,4,6) ,-5) ,4) ,-7) ,7) ) |step(transpose(echo(((transpose((((transpose(X,-5) +transpose((transpose(transpose(echo(X,4,6) ,-7) ,4) +transpose(X,12) ) ,4) ) +transpose(((transpose((echo(X,4,6) +transpose((transpose(X,-5) +transpose(((transpose(X,-5) +transpose(X,7) ) |shuffle(arpeggio(transpose(X,-5) ) ) ) ,12) ) ,7) ) ,4) +transpose(shuffle((step(transpose(X,4) ,12) |(shuffle(X) +X) ) ) ,4) ) +transpose(transpose(transpose(((((transpose(step(X,12) ,4) +transpose((transpose(X,-5) +transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) |(X+transpose((X+X) ,12) ) ) +transpose(((X+X) +step(X,12) ) ,4) ) ,-5) ,4) ,7) ) ,12) ) |echo(((transpose(((transpose(X,-7) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4) +transpose(echo(transpose(transpose(X,-7) ,4) ,4,6) ,12) ) +transpose((((transpose(X,-5) +transpose(((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) |X) ,7) ) +((arpeggio(X) +transpose(transpose(X,4) ,4) ) +transpose(X,-7) ) ) +transpose((transpose(((X+transpose(X,12) ) |arpeggio(X) ) ,-7) +shuffle(transpose(echo(X,4,6) ,-5) ) ) ,12) ) ,12) ) ,4,6) ) ,-5) +transpose(((((transpose((X+transpose((shuffle(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,-5) +transpose(shuffle(arpeggio(transpose(X,-5) ) ) ,7) ) +transpose(((arpeggio(X) +transpose(X,7) ) +transpose(transpose(transpose(((X+transpose(X,12) ) +X) ,-5) ,-7) ,7) ) ,7) ) +transpose((((((X+transpose(((transpose(X,-7) |(X+transpose(X,12) ) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,12) ) ) ,-5) ) ,12) ) +(arpeggio((X+X) ) |transpose(transpose(X,4) ,-7) ) ) +transpose(transpose((transpose(step(transpose(X,-7) ,12) ,4) +(((echo(transpose(X,-5) ,4,6) |((X|X) |transpose(X,-5) ) ) +transpose(transpose((((step(X,12) |(X+transpose(X,12) ) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ,-5) ,4) ) +transpose((X+transpose(transpose(X,-5) ,12) ) ,7) ) ) ,-7) ,4) ) +transpose((shuffle(transpose(transpose(transpose(X,-5) ,-5) ,-7) ) +transpose(transpose((X+X) ,4) ,4) ) ,7) ) +transpose(transpose(transpose(shuffle((X+transpose(X,7) ) ) ,-5) ,4) ,12) ) ,12) ) |shuffle((transpose((echo(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4,6) ,4,6) +shuffle(transpose((transpose(X,-7) +transpose(X,4) ) ,-5) ) ) ,-7) |transpose((transpose(transpose(((X|X) +shuffle(X) ) ,-7) ,4) +(transpose(echo(transpose(shuffle(X) ,-7) ,4,6) ,4) +((X|transpose(X,-5) ) +transpose(X,-7) ) ) ) ,-5) ) ) ) ,4) ) +transpose((echo(echo(transpose(step(shuffle(transpose(transpose((((X+transpose(transpose(X,-5) ,7) ) +transpose(transpose(transpose(X,-7) ,-5) ,4) ) +transpose(arpeggio((echo(X,4,6) +transpose(X,-5) ) ) ,7) ) ,-7) ,-5) ) ,12) ,-5) ,4,6) ,4,6) +transpose(((transpose(transpose((transpose((X+X) ,4) |((X+transpose((X+X) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,4) ,-5) +transpose(transpose(transpose(transpose(X,-7) ,4) ,-5) ,-7) ) +transpose(echo(echo(transpose(transpose((X|transpose(transpose(X,-7) ,-7) ) ,4) ,4) ,4,6) ,4,6) ,12) ) ,-5) ) ,7) ) ,4,6) ,4) ,12) ) ,12) )
random seed used was 86791632

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