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(shuffle((echo((((step(transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ,12) +arpeggio(arpeggio(((step(X,12) +transpose(arpeggio(transpose(X,4) ) ,7) ) +transpose(shuffle(echo(X,4,6) ) ,12) ) ) ) ) +transpose(shuffle(arpeggio(shuffle((echo(X,4,6) +transpose(arpeggio((X|arpeggio(X) ) ) ,12) ) ) ) ) ,4) ) +transpose((arpeggio(transpose(shuffle(X) ,-5) ) |step(((transpose(X,-7) +transpose(shuffle(X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) ,7) ) ,4,6) +transpose(step(transpose(arpeggio(transpose(shuffle(step(step(arpeggio(step(X,12) ) ,12) ,12) ) ,-7) ) ,-5) ,12) ,12) ) ) ,-7) +transpose(((shuffle((step((transpose(arpeggio(echo(arpeggio(X) ,4,6) ) ,-7) +shuffle(shuffle(step(transpose((X+X) ,-7) ,12) ) ) ) ,12) +transpose(step(transpose(((shuffle(step(arpeggio(echo(X,4,6) ) ,12) ) +transpose(step(step((X|X) ,12) ,12) ,4) ) +transpose(((arpeggio((((X|X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) +transpose(X,4) ) +transpose((transpose(shuffle(X) ,-7) +X) ,7) ) ,7) ) ,4) ,12) ,-5) ) ) |(arpeggio(transpose(transpose((step(arpeggio((((X+X) +shuffle(shuffle(X) ) ) |echo(X,4,6) ) ) ,12) +transpose(echo(transpose(((shuffle(step(X,12) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) ,4,6) ,12) ) ,4) ,-7) ) +transpose(transpose(step(((transpose((X+transpose((((shuffle(X) +transpose(step(X,12) ,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,4) +transpose(echo(((X+transpose(X,12) ) +echo(X,4,6) ) ,4,6) ,7) ) +transpose(shuffle(arpeggio((X+transpose(X,-7) ) ) ) ,-5) ) ,12) ,-7) ,12) ) ) |transpose(((step(shuffle(((((echo(arpeggio(X) ,4,6) +transpose(arpeggio(transpose(X,-7) ) ,12) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) +transpose(echo(echo(arpeggio(arpeggio(transpose(X,4) ) ) ,4,6) ,4,6) ,4) ) +transpose(transpose(arpeggio((transpose(arpeggio(X) ,4) +transpose(arpeggio(X) ,12) ) ) ,4) ,7) ) ) ,12) |transpose(echo(((shuffle(X) +transpose((X|echo(X,4,6) ) ,12) ) +transpose((transpose(transpose(X,4) ,-7) +transpose(X,7) ) ,12) ) ,4,6) ,-5) ) +((echo(arpeggio((step(transpose(X,-5) ,12) |arpeggio(echo((transpose(X,-5) +(X|arpeggio(X) ) ) ,4,6) ) ) ) ,4,6) +transpose(transpose((transpose((step((arpeggio(arpeggio(X) ) +transpose(transpose(X,-5) ,7) ) ,12) |transpose(arpeggio(transpose(shuffle(X) ,-5) ) ,4) ) ,-7) |arpeggio(step(((shuffle(transpose(X,-5) ) +transpose((((X|X) +(X|X) ) +shuffle(X) ) ,7) ) |echo(arpeggio(shuffle(X) ) ,4,6) ) ,12) ) ) ,-7) ,12) ) +step((((arpeggio(arpeggio(transpose(arpeggio(transpose(X,4) ) ,-7) ) ) +transpose(transpose((transpose(shuffle((X+transpose(X,7) ) ) ,4) +transpose(transpose(transpose(arpeggio(X) ,-7) ,4) ,12) ) ,4) ,7) ) +transpose(shuffle(transpose(transpose(((step(transpose(X,-7) ,12) +step(echo(X,4,6) ,12) ) |step(transpose(X,-5) ,12) ) ,4) ,-5) ) ,4) ) +transpose(arpeggio(transpose(step(X,12) ,4) ) ,7) ) ,12) ) ) ,-5) ) ,12) ) +(transpose(shuffle(transpose(transpose(transpose(step(transpose((((X|transpose(X,4) ) +(shuffle(X) +X) ) +shuffle((transpose(X,-5) +transpose(arpeggio(X) ,12) ) ) ) ,-5) ,12) ,4) ,-7) ,-5) ) ,-7) +transpose(transpose(transpose(shuffle(((transpose(transpose((transpose(shuffle(X) ,-5) +shuffle(echo(X,4,6) ) ) ,-5) ,-7) +(shuffle(echo((echo((transpose(shuffle(X) ,-5) |transpose(X,-7) ) ,4,6) +X) ,4,6) ) +transpose((transpose(((X|echo(shuffle((X|X) ) ,4,6) ) +transpose(echo(shuffle(echo(X,4,6) ) ,4,6) ,12) ) ,4) +transpose(transpose(transpose(echo(X,4,6) ,4) ,4) ,12) ) ,7) ) ) +((((shuffle((X+X) ) +transpose(arpeggio(arpeggio(X) ) ,12) ) |shuffle((transpose(((X+X) +transpose(arpeggio(X) ,7) ) ,4) +transpose(step(transpose(X,-5) ,12) ,7) ) ) ) +transpose(arpeggio((echo(X,4,6) +transpose((transpose((X+X) ,-7) +arpeggio(X) ) ,12) ) ) ,4) ) +transpose(step((step((((shuffle((X+transpose(X,12) ) ) +shuffle(X) ) +transpose((X+X) ,4) ) +transpose(((echo((X+X) ,4,6) +transpose(shuffle(X) ,4) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,7) ) ,12) +transpose(echo(((((step(X,12) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) ,7) ) ,12) ,7) ) ) ) ,-5) ,-5) ,12) ) ) ,-5)
random seed used was 103137889 EXPR = transpose((step((((transpose((transpose(transpose(echo(echo(transpose(arpeggio(X) ,4) ,4,6) ,4,6) ,-7) ,-5) +transpose(arpeggio((echo(arpeggio(X) ,4,6) +transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ) ,-7) ) ,-5) +transpose((transpose(transpose(X,-5) ,-7) +transpose(((shuffle(step(step(X,12) ,12) ) +transpose((((X+(X|X) ) +transpose(transpose(X,-7) ,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ,4) ) +transpose((shuffle(((X|X) +transpose((X|X) ,12) ) ) +echo(shuffle(X) ,4,6) ) ,7) ) ,4) ) ,-7) ) +transpose(step(transpose((echo((((echo(shuffle((X|X) ) ,4,6) +transpose(step(X,12) ,-5) ) +shuffle(echo(X,4,6) ) ) +step(transpose(arpeggio(transpose(X,-7) ) ,-7) ,12) ) ,4,6) +transpose((shuffle(((X+transpose(transpose(arpeggio(X) ,4) ,7) ) +transpose(shuffle(shuffle(transpose(X,4) ) ) ,7) ) ) +transpose((arpeggio(shuffle(((X|echo(X,4,6) ) +shuffle(step(X,12) ) ) ) ) +transpose(echo(transpose(transpose(X,-7) ,4) ,4,6) ,4) ) ,12) ) ,12) ) ,-7) ,12) ,4) ) +transpose((arpeggio((echo((arpeggio(echo(shuffle(transpose(X,4) ) ,4,6) ) |echo((step(X,12) |transpose(X,-7) ) ,4,6) ) ,4,6) +transpose(arpeggio(((arpeggio(shuffle(X) ) +transpose(transpose(step(echo(X,4,6) ,12) ,-7) ,7) ) +shuffle(shuffle((step(echo(X,4,6) ,12) +echo(X,4,6) ) ) ) ) ) ,7) ) ) +transpose((((transpose(echo((arpeggio(arpeggio(X) ) +arpeggio(X) ) ,4,6) ,-5) |(arpeggio(transpose((echo(X,4,6) +echo(shuffle(X) ,4,6) ) ,4) ) +transpose(((arpeggio(arpeggio(X) ) +transpose(((transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) |shuffle(X) ) ,4) ) +transpose(step(((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ,7) ) ) +transpose(arpeggio(step(echo(((echo(shuffle(shuffle(step(X,12) ) ) ,4,6) +transpose((transpose(shuffle(echo(X,4,6) ) ,-5) +(((arpeggio(X) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(X,4) ) ,7) ) +shuffle(transpose(X,-5) ) ) ) ,4) ) +transpose(arpeggio(step(arpeggio(shuffle(transpose(X,4) ) ) ,12) ) ,7) ) ,4,6) ,12) ) ,4) ) +transpose((echo(echo(((transpose(arpeggio(((X+transpose(X,7) ) |(X+transpose(X,7) ) ) ) ,4) +transpose(((transpose(X,4) +((X+X) |(X+transpose(X,7) ) ) ) +X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) ,4,6) |transpose(shuffle((shuffle(X) +transpose(shuffle(echo(X,4,6) ) ,12) ) ) ,-5) ) ,7) ) ,12) ) ,7) ) ,12) +transpose(transpose(step(step(echo(step(transpose((shuffle((((transpose(X,4) +transpose(arpeggio(X) ,4) ) +transpose(shuffle(X) ,7) ) +transpose((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ) +echo(step(X,12) ,4,6) ) ,-5) ,12) ,4,6) ,12) ,12) ,-5) ,12) ) ,-5)
random seed used was 0 EXPR = arpeggio(((transpose(((shuffle(step(X,12) ) +arpeggio(arpeggio(step((((transpose((X+transpose(X,12) ) ,-5) +transpose(echo(step(X,12) ,4,6) ,7) ) +transpose(((transpose(X,-7) +step(X,12) ) +X) ,4) ) +transpose(((((X+X) +transpose(X,12) ) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,7) ) ,12) ) ) ) |echo((arpeggio((((step(transpose(((X+transpose(shuffle(X) ,4) ) +transpose((X+X) ,7) ) ,-7) ,12) +transpose((step(transpose(X,-5) ,12) |transpose(X,-7) ) ,-7) ) +transpose(((echo(((X|X) +transpose(X,4) ) ,4,6) +echo(arpeggio(X) ,4,6) ) +transpose(step(shuffle(X) ,12) ,4) ) ,4) ) +transpose(echo((transpose(echo(X,4,6) ,4) +transpose(((echo(X,4,6) +transpose(step(X,12) ,12) ) +transpose(step((X|X) ,12) ,12) ) ,7) ) ,4,6) ,7) ) ) |transpose(echo(((X+X) +transpose(((step(X,12) |X) +(((transpose(X,4) +transpose(transpose(X,-5) ,12) ) +transpose(arpeggio(step((X|X) ,12) ) ,4) ) +transpose(step(echo(X,4,6) ,12) ,7) ) ) ,12) ) ,4,6) ,-5) ) ,4,6) ) ,-7) +transpose((echo(arpeggio(arpeggio(transpose(((transpose(transpose(echo(((transpose(X,-5) +transpose((X+X) ,4) ) +transpose((X|X) ,7) ) ,4,6) ,4) ,4) +transpose(arpeggio(shuffle(shuffle(((transpose(X,4) +transpose(X,4) ) +transpose((X|X) ,7) ) ) ) ) ,4) ) +transpose(echo(((X+transpose(X,7) ) |arpeggio(X) ) ,4,6) ,7) ) ,4) ) ) ,4,6) +step(((((step(X,12) |step(shuffle(transpose(X,4) ) ,12) ) +transpose(((arpeggio(echo(X,4,6) ) +transpose(echo(arpeggio(echo(X,4,6) ) ,4,6) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) ,4) ) +transpose(shuffle(shuffle(step(X,12) ) ) ,7) ) +((((arpeggio(((transpose(step((X+X) ,12) ,-7) +transpose((shuffle(X) +arpeggio(X) ) ,12) ) |(arpeggio(echo(X,4,6) ) +transpose(X,12) ) ) ) +transpose((transpose(echo(echo(X,4,6) ,4,6) ,-5) +arpeggio(transpose(transpose(X,-5) ,-5) ) ) ,4) ) +transpose((transpose(echo(X,4,6) ,-5) +transpose(((X+transpose(transpose((X|X) ,-7) ,4) ) +transpose((shuffle(echo(X,4,6) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,12) ) ,7) ) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,-5) ,12) ) +transpose(shuffle(step(echo(transpose(arpeggio(echo(X,4,6) ) ,-5) ,4,6) ,12) ) ,7) ) ) ,12) ) ,7) ) +transpose(echo(arpeggio((transpose(step(arpeggio(transpose((transpose(X,-7) |(X+X) ) ,4) ) ,12) ,-5) +transpose((shuffle(step((transpose(transpose(transpose(X,-7) ,4) ,-7) +(transpose(transpose(X,4) ,4) +transpose(X,12) ) ) ,12) ) +step((X+transpose(X,-5) ) ,12) ) ,7) ) ) ,4,6) ,7) ) )
random seed used was 0 EXPR = (((transpose((((transpose(transpose(arpeggio(((echo(transpose(X,4) ,4,6) |(transpose(X,-7) |transpose(arpeggio(X) ,-7) ) ) +transpose(X,12) ) ) ,-5) ,-7) |transpose((transpose(((((transpose(X,4) +(arpeggio(X) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ) +(transpose((transpose(X,4) |(X+X) ) ,-7) +step(X,12) ) ) +transpose(step(((echo(X,4,6) +transpose(step(X,12) ,7) ) +transpose(transpose(X,4) ,12) ) ,12) ,4) ) +transpose(echo((echo(X,4,6) +echo(X,4,6) ) ,4,6) ,7) ) ,-5) +transpose(transpose(shuffle(shuffle(((transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((X+transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,12) ) ) ) ,4) ,7) ) ,-5) ) +transpose(step(shuffle(transpose(transpose(shuffle(X) ,-5) ,4) ) ,12) ,7) ) |((transpose(transpose(arpeggio((((shuffle(echo(X,4,6) ) +transpose(transpose((X|X) ,-7) ,12) ) +transpose((X|(X+transpose(transpose(X,4) ,7) ) ) ,4) ) +transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,7) ) ) ,-7) ,4) |((((arpeggio(arpeggio((echo(X,4,6) +transpose(transpose(X,4) ,12) ) ) ) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(echo(arpeggio(transpose(X,4) ) ,4,6) ,-5) ) +transpose(transpose(echo(transpose((((transpose(X,4) +transpose(X,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose((arpeggio(transpose(X,-5) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,4) ,4,6) ,4) ,4) ) +transpose(arpeggio(shuffle(shuffle((shuffle(step(X,12) ) +transpose((echo(X,4,6) |(X+X) ) ,7) ) ) ) ) ,7) ) ) +transpose(echo(step((transpose((transpose((((transpose(X,4) +transpose(X,12) ) +transpose((shuffle(X) |X) ,12) ) +echo(step(X,12) ,4,6) ) ,-5) +transpose(echo(transpose(echo(((X+transpose(((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(step(X,12) ,7) ) ,7) ) ,4,6) ,-7) ,4,6) ,12) ) ,4) +transpose(transpose(shuffle((transpose(transpose(transpose(X,-7) ,-7) ,-5) +transpose(step((X+((X+transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,12) ,-5) ) ) ,4) ,12) ) ,12) ,4,6) ,7) ) ) ,-5) +transpose(echo(((transpose(transpose((((shuffle(transpose(X,-7) ) +transpose((step(step(transpose(X,-7) ,12) ,12) +(((((X|X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) +transpose(step(echo(X,4,6) ,12) ,7) ) +transpose(echo(X,4,6) ,12) ) ) ,12) ) +transpose(arpeggio((X+X) ) ,7) ) +transpose(echo((X|transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ) ,4,6) ,4) ) ,4) ,-7) +transpose(arpeggio((step(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) ) ,12) +transpose(shuffle((X+transpose(X,12) ) ) ,-5) ) ) ,12) ) +transpose((shuffle((shuffle(transpose(arpeggio(transpose(shuffle(((echo(X,4,6) |(X|X) ) |transpose(X,4) ) ) ,-5) ) ,-5) ) |(arpeggio(shuffle(transpose(X,4) ) ) |step((echo(step(X,12) ,4,6) +transpose(shuffle(transpose(((transpose(X,-5) +transpose(arpeggio(X) ,7) ) +arpeggio(X) ) ,4) ) ,12) ) ,12) ) ) ) |echo(arpeggio(transpose((((transpose(((X|X) +transpose(echo(X,4,6) ,7) ) ,-5) +transpose(transpose(echo(transpose(X,-7) ,4,6) ,-5) ,12) ) |shuffle((step(step(X,12) ,12) +transpose(arpeggio(arpeggio(X) ) ,7) ) ) ) +transpose((((echo((((X+transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) +transpose(X,-7) ) +transpose(step(((transpose(X,4) +transpose((X|X) ,4) ) +transpose(X,7) ) ,12) ,7) ) |transpose(shuffle(transpose(X,-7) ) ,4) ) ,7) ) ,-7) ) ,4,6) ) ,12) ) ,4,6) ,12) ) +(echo(transpose((arpeggio(X) +transpose(transpose(X,4) ,12) ) ,-5) ,4,6) +transpose(arpeggio(step(arpeggio(transpose(transpose(transpose(step(step((transpose(X,-7) +echo(X,4,6) ) ,12) ,12) ,4) ,4) ,-7) ) ,12) ) ,12) ) ) +transpose(echo(((step((step(shuffle(transpose(arpeggio((((transpose((X|X) ,-7) +((echo(X,4,6) |arpeggio(X) ) |shuffle(X) ) ) +transpose(((X+transpose(step(X,12) ,7) ) +transpose(step(X,12) ,7) ) ,7) ) +transpose(transpose((echo(X,4,6) |transpose(X,4) ) ,-5) ,7) ) ) ,4) ) ,12) +shuffle(((transpose(echo(transpose(X,-5) ,4,6) ,-7) +transpose(shuffle(arpeggio(X) ) ,7) ) |transpose(step(step(X,12) ,12) ,-5) ) ) ) ,12) +transpose(transpose(arpeggio(transpose(transpose(echo(transpose(echo((step(((X+X) +X) ,12) |shuffle((transpose(X,4) +transpose(transpose(X,-7) ,12) ) ) ) ,4,6) ,-7) ,4,6) ,-5) ,-7) ) ,-5) ,7) ) +transpose(shuffle((transpose(transpose(shuffle((transpose(shuffle(((echo(transpose(X,-5) ,4,6) +transpose(transpose(X,-7) ,12) ) |(((X+X) +transpose(transpose(X,4) ,4) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,7) ) ) ) ,-7) +(transpose(transpose(((step(arpeggio(X) ,12) +shuffle(echo((X|X) ,4,6) ) ) +transpose(step(shuffle(shuffle(step(X,12) ) ) ,12) ,7) ) ,-5) ,-7) |echo(echo((((X+transpose(X,7) ) +X) |transpose((transpose(X,-5) |X) ,4) ) ,4,6) ,4,6) ) ) ) ,-5) ,-5) |(transpose(step((((echo(transpose((arpeggio(X) |X) ,-7) ,4,6) +transpose(echo(((shuffle(X) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,4) ,4) ) +transpose(transpose(transpose(step(X,12) ,4) ,4) ,7) ) ,4,6) ,4) ) +transpose(arpeggio(echo((transpose(X,-7) +transpose(X,7) ) ,4,6) ) ,7) ) +transpose(echo((shuffle(echo((transpose(shuffle(X) ,-5) +transpose(arpeggio((X|X) ) ,12) ) ,4,6) ) +transpose(shuffle(transpose(transpose(((X|X) |echo(echo(X,4,6) ,4,6) ) ,-5) ,-7) ) ,7) ) ,4,6) ,7) ) ,12) ,4) +step(step(arpeggio((((step((X+transpose(transpose(X,-5) ,7) ) ,12) +(arpeggio(X) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) ) +shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) +arpeggio(((((X+X) +transpose(shuffle(((X+X) +transpose(X,7) ) ) ,7) ) +transpose(transpose(step(X,12) ,-7) ,4) ) +transpose(step((step(step((X+transpose(X,12) ) ,12) ,12) +transpose(shuffle((X+transpose(X,12) ) ) ,12) ) ,12) ,7) ) ) ) ) ,12) ,12) ) ) ) ,12) ) ,4,6) ,12) )
random seed used was 0

NOTE: Generated phrase was too large ( 21004 ) , it has been truncated at 5000 notes.


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