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 20 generations the expression "X" became this:
((step(((step(transpose(((shuffle((transpose(echo(X,4,6) ,-7) +transpose(shuffle(X) ,-7) ) ) +transpose((shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(arpeggio(((step(X,12) +transpose(echo(X,4,6) ,7) ) +transpose(X,7) ) ) ,7) ) ,-5) ,12) |((((transpose(shuffle(X) ,-5) +transpose(shuffle(X) ,4) ) +transpose((echo(X,4,6) +transpose(echo(transpose(X,-7) ,4,6) ,-7) ) ,7) ) +transpose((transpose(X,-7) +(arpeggio(X) +transpose((X+X) ,7) ) ) ,7) ) +transpose((transpose((transpose(echo((X+X) ,4,6) ,-5) +transpose(echo(X,4,6) ,12) ) ,-7) +transpose(((((X+X) +transpose((X|X) ,4) ) +transpose((X+X) ,7) ) +transpose(arpeggio(X) ,7) ) ,-5) ) ,7) ) ) +transpose(transpose(shuffle((transpose(transpose((X+X) ,-5) ,-7) +transpose(echo(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,12) ) ) ,4) ,7) ) ,12) +transpose(step(step(transpose((((transpose(echo(echo((transpose(transpose(X,4) ,-7) |((arpeggio(arpeggio(transpose(X,-7) ) ) +transpose(shuffle((((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(echo(X,4,6) ,4) ) +transpose((((step((X+transpose(X,7) ) ,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose((transpose(transpose(X,-5) ,-7) +transpose((X+transpose(X,12) ) ,12) ) ,12) ) ,7) ) ) ,4) ) +transpose(transpose(transpose(echo(echo(((X+transpose(transpose(X,-7) ,4) ) +transpose((X|X) ,7) ) ,4,6) ,4,6) ,4) ,4) ,7) ) ) ,4,6) ,4,6) ,-7) +transpose((((echo(shuffle(((X+echo(X,4,6) ) +transpose(echo(transpose(arpeggio(X) ,-5) ,4,6) ,12) ) ) ,4,6) |((shuffle(step(transpose(((shuffle(transpose(step(X,12) ,-7) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ,7) ) ,4) ,12) ) +transpose(echo(transpose(shuffle((X+X) ) ,-5) ,4,6) ,4) ) +transpose(transpose((transpose((transpose(echo(echo(X,4,6) ,4,6) ,-5) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +shuffle(X) ) ,12) ) ,-7) +transpose(transpose(step(shuffle(X) ,12) ,4) ,7) ) ,-5) ,7) ) ) +transpose(transpose(transpose(((((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,-7) ,-7) ,4) ) |transpose(echo(transpose(arpeggio((step(shuffle((transpose(X,4) +arpeggio(X) ) ) ,12) +transpose((step(X,12) +transpose(echo(step(X,12) ,4,6) ,12) ) ,7) ) ) ,-5) ,4,6) ,4) ) ,4) ) +transpose(step(transpose(echo(transpose((echo(X,4,6) +(arpeggio(X) +transpose((X|X) ,7) ) ) ,4) ,4,6) ,-5) ,12) ,7) ) +(((step(step(((step(((X+X) |(X+transpose(X,12) ) ) ,12) +transpose((X+transpose((step(arpeggio(X) ,12) +transpose(step((X+X) ,12) ,12) ) ,12) ) ,4) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ,12) ,12) +transpose(((((transpose(transpose(X,4) ,4) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) +transpose((X+(((X+transpose(X,7) ) +transpose(X,12) ) +transpose(transpose(echo(X,4,6) ,-5) ,12) ) ) ,7) ) +transpose(((X+transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,7) ) |transpose(echo(X,4,6) ,-5) ) ,7) ) |arpeggio(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,4) ) +transpose(shuffle((arpeggio(((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) +transpose(transpose(((shuffle(transpose(X,4) ) +transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ) ,7) ) +transpose(transpose(transpose((step(shuffle(arpeggio((X+transpose(X,7) ) ) ) ,12) +(transpose((X|X) ,-7) |X) ) ,-5) ,4) ,7) ) ) ,-5) ,12) ,12) ,7) ) +transpose(arpeggio(((transpose(transpose(shuffle(((transpose(((transpose(shuffle(X) ,-5) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +(transpose(X,-5) |step(X,12) ) ) ,-5) ) +((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) ,-7) +transpose((arpeggio(arpeggio(shuffle(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) ) ) ) +transpose((((echo(step(echo((X+transpose(X,12) ) ,4,6) ,12) ,4,6) +transpose(((((X+arpeggio(X) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) |X) ,4) ) +transpose(echo(((((X+transpose(X,12) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) |step(X,12) ) ,4,6) ,7) ) +transpose((shuffle((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) ) +step(step(echo((X|X) ,4,6) ,12) ,12) ) ,7) ) ,7) ) ,7) ) |echo(step(echo(((transpose(echo(X,4,6) ,-5) +transpose(X,7) ) +transpose(X,12) ) ,4,6) ,12) ,4,6) ) ) ,-5) ,-7) +transpose((arpeggio(((arpeggio(echo(shuffle(arpeggio(((shuffle(X) +transpose((X|X) ,4) ) +transpose((X+X) ,7) ) ) ) ,4,6) ) |step((transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose(arpeggio(transpose(transpose(((shuffle(echo(shuffle(arpeggio(X) ) ,4,6) ) +transpose(transpose(transpose(step(X,12) ,-7) ,-7) ,4) ) +transpose((X+transpose(arpeggio(transpose(X,4) ) ,7) ) ,7) ) ,-5) ,4) ) ,7) ) ,12) ) +transpose(echo((transpose(((((step((X|X) ,12) +X) +transpose(transpose(transpose(X,-5) ,-5) ,4) ) +transpose((X+transpose(echo((X+transpose(X,7) ) ,4,6) ,12) ) ,7) ) +transpose((((echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4,6) +transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) +transpose(echo(echo((X|X) ,4,6) ,4,6) ,4) ) +transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,7) ) ,4) +transpose(step(transpose((echo(X,4,6) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((step(X,12) |transpose(X,4) ) ,7) ) ,4) ) ,-5) ,12) ,7) ) ,4,6) ,12) ) ) +transpose((arpeggio(transpose((((((echo(X,4,6) +step(X,12) ) +transpose(transpose((X|X) ,-7) ,4) ) +transpose(step(X,12) ,7) ) +transpose(((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) +transpose(transpose((step(X,12) +transpose(transpose(X,4) ,7) ) ,-7) ,7) ) ,7) ) |transpose((shuffle(echo(X,4,6) ) +transpose(transpose((X+X) ,-5) ,7) ) ,-5) ) ,4) ) +transpose((((arpeggio(arpeggio(((arpeggio(echo(X,4,6) ) +transpose((transpose(X,-5) +(X+transpose(shuffle(X) ,7) ) ) ,4) ) +transpose(echo((arpeggio(shuffle(X) ) +transpose(step(shuffle(X) ,12) ,7) ) ,4,6) ,7) ) ) ) |((step(shuffle(X) ,12) +transpose(transpose((arpeggio((echo(X,4,6) +transpose(arpeggio(X) ,7) ) ) +transpose(transpose(arpeggio(X) ,-5) ,12) ) ,-7) ,4) ) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(((X|X) |transpose(X,-5) ) ,7) ) ,4) ,7) ) ) +transpose(echo(((arpeggio(transpose(arpeggio(transpose(echo(X,4,6) ,4) ) ,-7) ) +transpose(((echo(step(shuffle(X) ,12) ,4,6) +(((X+X) +transpose((X+X) ,12) ) +transpose(((arpeggio(step(X,12) ) +transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ) +((transpose((echo(transpose(X,-5) ,4,6) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,-5) ,7) ) ,-5) +transpose(step(shuffle(transpose((X|shuffle(X) ) ,-7) ) ,12) ,4) ) +transpose((echo(arpeggio((X+transpose(X,7) ) ) ,4,6) +((X+X) +((X+transpose(X,12) ) +transpose(X,12) ) ) ) ,7) ) ) ,4) ) +transpose((transpose((step(X,12) +transpose(X,7) ) ,-7) +transpose((echo((transpose(X,4) |(transpose(X,4) +transpose(transpose(X,-5) ,7) ) ) ,4,6) +transpose(transpose(X,-7) ,4) ) ,7) ) ,7) ) ,4,6) ,4) ) +transpose(transpose(((arpeggio(transpose(arpeggio(transpose(step(X,12) ,4) ) ,4) ) +transpose((echo(echo(step(transpose(transpose(X,4) ,-5) ,12) ,4,6) ,4,6) |(arpeggio(X) +transpose(echo(((transpose(X,-7) +transpose((arpeggio(X) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(transpose(step(X,12) ,-5) ,7) ) ,4,6) ,7) ) ) ,4) ) +transpose(((step(transpose(transpose(X,-5) ,-7) ,12) +transpose(step((X+transpose(transpose(X,4) ,12) ) ,12) ,7) ) +transpose(shuffle(arpeggio(((shuffle(X) +transpose((X+transpose(X,7) ) ,12) ) +echo(arpeggio((X+X) ) ,4,6) ) ) ) ,7) ) ,7) ) ,-5) ,7) ) ,7) ) ,12) ) ,4) ) +transpose(shuffle((((((((transpose(transpose(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,-7) +transpose(shuffle(arpeggio(shuffle((X+transpose(X,7) ) ) ) ) ,12) ) +transpose((echo((shuffle(X) |(X|shuffle(echo(X,4,6) ) ) ) ,4,6) |(transpose(X,-7) |shuffle(transpose(shuffle(X) ,-5) ) ) ) ,4) ) +transpose(arpeggio(arpeggio((X+(transpose(X,-5) +transpose(X,7) ) ) ) ) ,7) ) |((transpose((arpeggio(transpose(X,-5) ) +arpeggio((transpose((X|X) ,-5) |(arpeggio(X) +transpose(X,7) ) ) ) ) ,4) +transpose((transpose(transpose((X+arpeggio(X) ) ,-5) ,4) |transpose((echo(X,4,6) +transpose(transpose(X,-5) ,7) ) ,4) ) ,4) ) +transpose(((((transpose((((X|echo(X,4,6) ) +transpose(X,4) ) +transpose(arpeggio((X+X) ) ,7) ) ,4) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose(echo(X,4,6) ,12) ) ,4) ) +transpose(transpose(step(X,12) ,-5) ,7) ) +transpose(arpeggio(echo(transpose(X,4) ,4,6) ) ,4) ) +transpose((shuffle(X) |transpose((arpeggio(step(X,12) ) +step((X+transpose(X,7) ) ,12) ) ,4) ) ,7) ) ,7) ) ) +(((((step(step(X,12) ,12) +transpose(transpose(((echo(X,4,6) +transpose((step(X,12) +X) ,4) ) +transpose((X+X) ,7) ) ,4) ,4) ) +transpose((((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(shuffle(X) ,4) ) +transpose(step((X+transpose(transpose(X,-7) ,12) ) ,12) ,7) ) ,7) ) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(step(((((shuffle(echo(X,4,6) ) +arpeggio((shuffle(X) |step(X,12) ) ) ) +transpose((shuffle(echo(transpose(X,-7) ,4,6) ) +echo(step(transpose(X,-7) ,12) ,4,6) ) ,4) ) +transpose(transpose((echo(X,4,6) +transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,12) ) ,-5) ,7) ) +(transpose(shuffle((step(X,12) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) +transpose(transpose((shuffle(X) +transpose(((X+X) +transpose(shuffle(X) ,7) ) ,-7) ) ,4) ,7) ) ) ,12) ,4) ) +transpose((transpose(((((transpose(X,-7) +transpose((transpose((X+transpose(transpose(X,4) ,12) ) ,-7) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,4) ) +transpose((X+transpose(transpose(transpose(X,-7) ,-7) ,12) ) ,7) ) +transpose(transpose(arpeggio((transpose(arpeggio(X) ,4) |(X+X) ) ) ,4) ,4) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ,4) |(shuffle(arpeggio(transpose(X,-7) ) ) +transpose(arpeggio(((transpose(X,-5) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) ) ,7) ) ) +transpose(((arpeggio(shuffle(arpeggio(transpose(transpose(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ,4) ,-5) ) ) ) |((((arpeggio((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ) +transpose(arpeggio((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose((X+X) ,7) ) ) ,7) ) +transpose(echo((((shuffle(X) +transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,4,6) ,4) ) +transpose(transpose((echo(transpose(X,-7) ,4,6) +transpose(shuffle(arpeggio(X) ) ,7) ) ,-5) ,7) ) +arpeggio(shuffle((transpose(X,-5) +transpose((X|X) ,7) ) ) ) ) ) +transpose(step(echo((echo(((((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) |X) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(shuffle((X+X) ) ,7) ) ,7) ) +transpose((((arpeggio(X) +transpose(transpose(step(X,12) ,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |arpeggio(((X+transpose(shuffle(X) ,12) ) +transpose(transpose(X,4) ,7) ) ) ) ,4) ) +transpose(transpose((step(((step(X,12) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(X,7) ) ,12) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,4) ) ,-5) ,7) ) ,4,6) +transpose((((transpose(transpose(X,4) ,4) +transpose(((arpeggio((X+transpose(X,7) ) ) +transpose(X,7) ) +transpose(echo(((step(shuffle(X) ,12) +transpose(transpose(X,-7) ,4) ) +transpose(shuffle(X) ,7) ) ,4,6) ,7) ) ,7) ) +transpose(transpose(shuffle(arpeggio(transpose(X,-7) ) ) ,-5) ,7) ) +transpose(transpose(echo(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,4) ,7) ) ,7) ) ,4,6) ,12) ,7) ) ,4) ) +transpose(((((echo(((((transpose((transpose(X,4) +(X+transpose(X,7) ) ) ,-7) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(arpeggio(X) ,4) ) ,7) ) +transpose(((transpose(X,-7) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose((shuffle(echo(X,4,6) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,4) ) +transpose(transpose((((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(((arpeggio(transpose(X,-7) ) +transpose(((X|X) +(X+X) ) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ,7) ) ,4,6) +transpose((arpeggio(transpose(((X+transpose(X,7) ) +X) ,4) ) +shuffle(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) ) ,7) ) |(((transpose(echo(step(X,12) ,4,6) ,-5) +transpose(((transpose(X,4) +transpose((X|X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ) |transpose((X|X) ,4) ) +transpose(((((transpose(X,-7) +transpose(X,7) ) +transpose(transpose((((arpeggio((X+transpose(X,12) ) ) +transpose(transpose(X,-7) ,4) ) +transpose((X+arpeggio(X) ) ,7) ) +transpose((transpose((transpose(X,-5) +transpose(X,7) ) ,-7) +transpose((shuffle((X|X) ) |transpose(X,-7) ) ,12) ) ,7) ) ,-5) ,4) ) +transpose(echo(((transpose(X,4) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4,6) ,7) ) +transpose(((X+transpose(X,7) ) |(X|X) ) ,4) ) ,7) ) ) +transpose(transpose(transpose((transpose(arpeggio((((transpose(X,4) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) +transpose(((transpose(echo(X,4,6) ,-5) +transpose(arpeggio(X) ,4) ) +transpose(((echo(X,4,6) +transpose(echo(X,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,4) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ) ,-5) +transpose((shuffle(transpose(shuffle(echo(X,4,6) ) ,-7) ) +transpose(echo(step(step((X+echo((X+X) ,4,6) ) ,12) ,12) ,4,6) ,7) ) ,7) ) ,-5) ,-5) ,4) ) +transpose(transpose(((((((((X+step(X,12) ) +transpose(echo(echo(shuffle(X) ,4,6) ,4,6) ,7) ) +transpose((echo(echo(X,4,6) ,4,6) +transpose(transpose(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ,4) ,7) ) ,7) ) +transpose(((((transpose(step(X,12) ,4) +transpose(X,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) +transpose(shuffle((transpose(X,4) +((X+transpose(X,7) ) +transpose((X+X) ,7) ) ) ) ,4) ) +transpose((arpeggio(transpose(step(X,12) ,-5) ) +transpose((arpeggio(transpose(X,4) ) +X) ,7) ) ,7) ) ,7) ) +transpose((echo(echo(transpose(shuffle(shuffle(X) ) ,-7) ,4,6) ,4,6) +transpose(((((arpeggio(X) |transpose(X,-5) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,7) ) ,4) ) +transpose(shuffle(transpose((X+(X|X) ) ,4) ) ,7) ) +transpose(echo(arpeggio((transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) +transpose((X+transpose(X,7) ) ,7) ) ) ,4,6) ,4) ) +transpose(arpeggio(transpose(echo(echo(step(arpeggio(X) ,12) ,4,6) ,4,6) ,4) ) ,7) ) ,4) ,7) ) ,7) ) ) ,7) ) ) ,7) )
random seed used was 230126500

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