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:
Seed:
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Phrase for X:
# of Tracks:
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After 20 generations the expression "X" became this:
arpeggio(transpose(shuffle(arpeggio(((arpeggio(step((transpose(arpeggio(step(arpeggio(arpeggio(arpeggio(arpeggio(X) ) ) ) ,12) ) ,4) |arpeggio((shuffle(shuffle(transpose(X,-5) ) ) |shuffle(transpose(step((arpeggio(X) +transpose(step((X+transpose(X,12) ) ,12) ,12) ) ,12) ,-7) ) ) ) ) ,12) ) +transpose(step((shuffle(shuffle(((transpose(transpose((transpose(X,-7) +transpose(echo(step(X,12) ,4,6) ,12) ) ,4) ,-5) |((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) +step(echo(X,4,6) ,12) ) ) +((transpose((((transpose(X,4) +transpose((X+X) ,7) ) +transpose(transpose(arpeggio(step(X,12) ) ,-7) ,7) ) +transpose(((step(X,12) +transpose(transpose(X,-7) ,12) ) +shuffle(transpose(X,-5) ) ) ,12) ) ,4) |echo(step((arpeggio(shuffle(X) ) +transpose(X,12) ) ,12) ,4,6) ) +transpose(((shuffle(echo((transpose((X+transpose(X,12) ) ,4) +transpose((X|X) ,12) ) ,4,6) ) +transpose(shuffle(((transpose(step((X|X) ,12) ,-5) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(step(arpeggio(echo(X,4,6) ) ,12) ,7) ) ) ,4) ) +transpose(transpose(((echo(step(X,12) ,4,6) |step(step(X,12) ,12) ) +transpose((transpose(X,-5) |X) ,7) ) ,4) ,7) ) ,12) ) ) ) ) +transpose((arpeggio(transpose(shuffle(((transpose(shuffle(arpeggio(transpose(X,-7) ) ) ,-7) |((X+transpose((X|X) ,4) ) +transpose(transpose((echo(X,4,6) |(X|X) ) ,4) ,7) ) ) +transpose((((step((X|X) ,12) |shuffle(arpeggio(X) ) ) +transpose(echo(X,4,6) ,12) ) +transpose(arpeggio(arpeggio(X) ) ,4) ) ,12) ) ) ,-7) ) |(arpeggio((step((step((X+(X|X) ) ,12) +transpose(arpeggio(X) ,4) ) ,12) +transpose((step(shuffle(X) ,12) +(((X+transpose(X,12) ) +step(X,12) ) |shuffle(step(X,12) ) ) ) ,7) ) ) +shuffle(transpose(transpose(transpose((((shuffle(X) +transpose(((arpeggio(X) |arpeggio(X) ) +transpose(X,7) ) ,7) ) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(X,7) ) ,-5) ,-5) ,-7) ) ) ) ,12) ) ,12) ,4) ) +transpose(arpeggio(transpose(arpeggio((transpose(transpose(transpose((arpeggio((arpeggio(X) +transpose(arpeggio(X) ,7) ) ) +transpose(step(arpeggio(transpose(X,-5) ) ,12) ,12) ) ,4) ,4) ,-5) |shuffle((X+transpose(step(shuffle(X) ,12) ,12) ) ) ) ) ,-5) ) ,7) ) ) ) ,-7) )
random seed used was 17539 EXPR = transpose(arpeggio(((((transpose(transpose(arpeggio(echo(shuffle(shuffle((transpose((X+transpose(X,7) ) ,-7) +((X+X) +transpose(arpeggio(X) ,7) ) ) ) ) ,4,6) ) ,-7) ,4) +transpose((transpose(transpose(shuffle(echo(transpose((transpose(transpose(((transpose(X,-5) |X) |X) ,-5) ,-5) |(shuffle(transpose(X,-7) ) +transpose(transpose(transpose(shuffle(shuffle(X) ) ,-7) ,-7) ,7) ) ) ,-7) ,4,6) ) ,-5) ,4) +transpose(shuffle((transpose((((arpeggio((transpose(step(step(arpeggio(X) ,12) ,12) ,-5) |transpose(((((X+transpose(echo(X,4,6) ,4) ) +transpose((X|X) ,7) ) +transpose(echo(arpeggio(transpose(X,-5) ) ,4,6) ,4) ) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,-7) ) ) +shuffle(transpose(transpose(X,4) ,-5) ) ) +transpose(shuffle((X+transpose(step(transpose(X,-7) ,12) ,7) ) ) ,4) ) +transpose(transpose(transpose((((echo(transpose(X,-7) ,4,6) +transpose(echo(X,4,6) ,4) ) +transpose(step(echo(X,4,6) ,12) ,7) ) +step((arpeggio(arpeggio(X) ) +transpose(((X|X) |(X+transpose(X,7) ) ) ,12) ) ,12) ) ,4) ,4) ,7) ) ,-5) +transpose(((transpose((step(transpose(((((arpeggio(X) +transpose(X,12) ) +step(((X+X) +transpose(transpose(X,4) ,7) ) ,12) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(transpose(echo((((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4,6) ,-5) ,7) ) ,-5) ,12) +transpose((arpeggio((arpeggio((transpose(transpose(X,-5) ,-5) +transpose(transpose(arpeggio(transpose(X,-5) ) ,4) ,7) ) ) +echo(step(X,12) ,4,6) ) ) |transpose(transpose(arpeggio(transpose(transpose(X,4) ,-5) ) ,-7) ,-5) ) ,12) ) ,-5) +transpose(shuffle(arpeggio(((arpeggio(arpeggio(((X+X) +shuffle(X) ) ) ) |step(echo(X,4,6) ,12) ) |arpeggio(((transpose((X|step(X,12) ) ,-7) +transpose(transpose(shuffle(transpose(X,-5) ) ,4) ,4) ) +transpose((((X+X) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,7) ) ) ) ) ) ,4) ) +transpose(arpeggio(echo(transpose(arpeggio(step(shuffle((step((X+transpose(X,12) ) ,12) +transpose(step(X,12) ,-5) ) ) ,12) ) ,-5) ,4,6) ) ,7) ) ,7) ) ) ,7) ) ,4) ) +transpose((shuffle(transpose(shuffle((((step(step(arpeggio(X) ,12) ,12) +transpose((((X|X) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose((X|arpeggio(X) ) ,-7) ,-5) ,7) ) +transpose(echo((step(arpeggio(step(X,12) ) ,12) +transpose(transpose(((transpose(X,4) +transpose(arpeggio(X) ,4) ) +transpose((X+X) ,7) ) ,-7) ,7) ) ,4,6) ,12) ) ) ,4) ) +transpose(transpose(arpeggio((shuffle((shuffle(shuffle(arpeggio(echo(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,4,6) ) ) ) +step(arpeggio(step(step(arpeggio(((transpose(X,-7) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,12) ,12) ) ,12) ) ) +transpose(transpose(step(step(echo(shuffle(transpose(X,-7) ) ,4,6) ,12) ,12) ,4) ,12) ) ) ,4) ,7) ) ,7) ) +transpose(arpeggio(transpose(transpose(shuffle(transpose(shuffle(((shuffle(((X+X) |step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) +((transpose(shuffle((X+step(X,12) ) ) ,4) +step(transpose(shuffle(X) ,-5) ,12) ) +transpose(transpose(shuffle((X|(step(X,12) |transpose(X,-5) ) ) ) ,-7) ,12) ) ) ) ,-7) ) ,-7) ,4) ) ,4) ) +transpose(step(transpose(transpose(shuffle(((step(transpose((transpose(arpeggio(shuffle(transpose(echo(transpose(X,-5) ,4,6) ,4) ) ) ,-7) +transpose((arpeggio(arpeggio(X) ) |(X|X) ) ,12) ) ,4) ,12) +transpose(((((step(step(arpeggio(transpose(X,-7) ) ,12) ,12) |((((step(shuffle(X) ,12) +transpose(transpose(X,4) ,4) ) +transpose(step((X+X) ,12) ,7) ) +transpose(arpeggio(arpeggio((X|X) ) ) ,4) ) +transpose(echo(arpeggio(transpose((X+(X|X) ) ,4) ) ,4,6) ,7) ) ) |((((shuffle(X) +transpose(echo(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,7) ) +transpose(shuffle(step((arpeggio(arpeggio(X) ) +(((shuffle(X) |(X+transpose(X,12) ) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) ,12) ) ,7) ) +transpose(((((transpose((X|X) ,-5) +transpose(transpose(transpose(X,-5) ,4) ,-7) ) +transpose(((transpose(X,-5) |transpose(X,-5) ) +transpose(step(arpeggio(X) ,12) ,7) ) ,4) ) +transpose(((X+transpose(shuffle(X) ,7) ) +step(X,12) ) ,7) ) +transpose(step(transpose(step(step(X,12) ,12) ,-7) ,12) ,12) ) ,7) ) +transpose(transpose(arpeggio((transpose(arpeggio(transpose(arpeggio(X) ,4) ) ,-5) +transpose(step(transpose((X+X) ,-5) ,12) ,7) ) ) ,-7) ,7) ) ) +transpose(step(step(((transpose(((arpeggio(X) |((shuffle(X) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,4) ,7) ) ) +arpeggio(X) ) ,4) |step(arpeggio(X) ,12) ) +transpose(((((shuffle((shuffle(step(X,12) ) +transpose((shuffle(X) +arpeggio(X) ) ,7) ) ) +transpose(transpose(shuffle(step(X,12) ) ,-5) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) +transpose(transpose(((X+X) |echo(X,4,6) ) ,4) ,4) ) +transpose(transpose(((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +(shuffle(X) +(X+step(X,12) ) ) ) +transpose(transpose((transpose(X,-7) +transpose(X,-5) ) ,-7) ,7) ) ,-7) ,7) ) ,12) ) ,12) ,12) ,7) ) +transpose((X+transpose(transpose(((arpeggio(X) +transpose((X+X) ,4) ) +transpose(step(X,12) ,7) ) ,-5) ,7) ) ,7) ) ,4) ) +transpose((echo(transpose(((shuffle(echo(X,4,6) ) |echo((((X|X) +transpose(arpeggio(arpeggio(X) ) ,7) ) |(transpose(X,4) +transpose(transpose((X+transpose(X,12) ) ,4) ,12) ) ) ,4,6) ) +transpose(transpose(transpose(arpeggio(X) ,-5) ,4) ,7) ) ,-5) ,4,6) +transpose(shuffle(transpose(((step(X,12) +transpose(step(X,12) ,12) ) +arpeggio(step((X+X) ,12) ) ) ,-7) ) ,7) ) ,7) ) ) ,4) ,4) ,12) ,7) ) ) ,-5)
random seed used was 0 EXPR = transpose(arpeggio(echo((transpose(transpose(shuffle(transpose(shuffle(shuffle(arpeggio(X) ) ) ,-7) ) ,4) ,-7) +(((transpose(transpose(transpose((transpose(arpeggio((X|X) ) ,4) +arpeggio(step(transpose(step(shuffle((X+transpose(X,12) ) ) ,12) ,4) ,12) ) ) ,4) ,-7) ,4) +transpose((((((transpose(step(shuffle(step(X,12) ) ,12) ,4) |transpose(arpeggio(arpeggio(transpose(transpose(X,-7) ,4) ) ) ,-5) ) +transpose((transpose(echo(transpose(arpeggio(arpeggio((X|X) ) ) ,4) ,4,6) ,-7) +transpose((shuffle(echo(shuffle(X) ,4,6) ) |transpose((arpeggio(X) +transpose((X|X) ,12) ) ,-7) ) ,12) ) ,12) ) +transpose(transpose(arpeggio(((transpose(((step(X,12) |shuffle(arpeggio((X+transpose(X,7) ) ) ) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,-7) +transpose(shuffle(step(X,12) ) ,4) ) +step((transpose(((X+X) +echo(X,4,6) ) ,-5) +transpose(transpose(step(transpose(transpose(shuffle(X) ,-5) ,-5) ,12) ,4) ,7) ) ,12) ) ) ,-7) ,4) ) +transpose(((((transpose(((((X+transpose((arpeggio(X) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +echo(X,4,6) ) |(((step(X,12) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(((X+X) +transpose((X+X) ,7) ) ,12) ) ) ,4) +transpose((step((transpose(arpeggio(X) ,-7) +arpeggio(X) ) ,12) +((transpose(X,4) +X) +step(shuffle((X+X) ) ,12) ) ) ,12) ) +transpose((transpose(arpeggio(transpose(shuffle(X) ,-5) ) ,4) +transpose(arpeggio((arpeggio(transpose(arpeggio((X+X) ) ,4) ) +arpeggio(arpeggio(arpeggio(X) ) ) ) ) ,7) ) ,12) ) +transpose(((((transpose(step(X,12) ,4) +transpose((transpose(step((X+transpose(X,7) ) ,12) ,-7) +transpose(shuffle(X) ,12) ) ,12) ) +transpose(arpeggio(transpose(shuffle(X) ,-5) ) ,4) ) +transpose(transpose(arpeggio((transpose(X,-7) +shuffle(arpeggio(X) ) ) ) ,-5) ,7) ) +transpose(transpose((shuffle(X) +transpose(X,-5) ) ,4) ,7) ) ,4) ) +transpose(echo(transpose(arpeggio(arpeggio(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +X) ) ) ) ,-7) ,4,6) ,7) ) ,7) ) +transpose(transpose((step(echo(arpeggio(echo(step(X,12) ,4,6) ) ,4,6) ,12) +transpose(step(step(transpose((transpose(X,-7) +transpose((X+X) ,-7) ) ,-7) ,12) ,12) ,12) ) ,4) ,-7) ) ,4) ) +transpose(((arpeggio((step(transpose(((shuffle(step((X+X) ,12) ) +(arpeggio(transpose(X,-7) ) +arpeggio((shuffle(X) +transpose(X,7) ) ) ) ) +step(X,12) ) ,4) ,12) +transpose(arpeggio(echo((shuffle(shuffle(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ) +transpose(step(step(echo(X,4,6) ,12) ,12) ,4) ) ,4,6) ) ,12) ) ) |(step(arpeggio(shuffle((X+transpose(arpeggio(X) ,7) ) ) ) ,12) |echo((transpose(((shuffle((shuffle(X) +X) ) +transpose(transpose(transpose(shuffle(X) ,4) ,-5) ,4) ) +transpose((((transpose(X,4) |(X|X) ) |transpose(X,-7) ) +transpose(echo(shuffle(shuffle(X) ) ,4,6) ,12) ) ,7) ) ,-7) +(((echo(X,4,6) +transpose(transpose((X+X) ,-7) ,12) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) +transpose(transpose(transpose((transpose(shuffle(X) ,-5) +transpose((transpose(X,4) |X) ,12) ) ,4) ,-7) ,12) ) ) ,4,6) ) ) +transpose((step(transpose(arpeggio(transpose(transpose(X,-5) ,-7) ) ,4) ,12) +transpose(transpose(echo((((((((X+transpose(step(X,12) ,7) ) +transpose(arpeggio((X+X) ) ,7) ) +transpose(arpeggio(X) ,7) ) +step(transpose((X+transpose(X,7) ) ,-5) ,12) ) |shuffle((echo(X,4,6) |step(((X|X) +transpose(X,12) ) ,12) ) ) ) +transpose(shuffle((X+X) ) ,4) ) +transpose((step((X+transpose(X,12) ) ,12) +transpose((shuffle((X+transpose(X,7) ) ) +transpose(arpeggio(X) ,12) ) ,7) ) ,7) ) ,4,6) ,-7) ,7) ) ,7) ) ,7) ) +(step(transpose((echo(arpeggio(transpose(transpose(X,-5) ,-7) ) ,4,6) +(transpose(arpeggio(X) ,-7) +transpose(((X+transpose(((step(X,12) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) ,-7) ,12) |(shuffle(step(step(transpose(arpeggio(echo(X,4,6) ) ,4) ,12) ,12) ) +transpose(shuffle((((step(step(X,12) ,12) +transpose(echo(step(step(transpose(transpose(X,-5) ,-7) ,12) ,12) ,4,6) ,12) ) +transpose(((((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) +transpose(step(arpeggio(X) ,12) ,4) ) +transpose(X,7) ) +transpose(shuffle((X+X) ) ,4) ) +transpose((transpose(X,-5) |(X|step(X,12) ) ) ,7) ) ,7) ) +arpeggio(arpeggio((transpose(arpeggio(step((X|X) ,12) ) ,4) +arpeggio(transpose(X,-5) ) ) ) ) ) ) ,7) ) ) ) ) ,4,6) ) ,-7)
random seed used was 0

NOTE: Generated phrase was too large ( 6855 ) , it has been truncated at 5000 notes. EXPR = arpeggio(transpose((transpose(((echo(shuffle(X) ,4,6) +((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) +transpose((shuffle(transpose(X,4) ) |(X+transpose((X+transpose(X,7) ) ,12) ) ) ,7) ) ) +transpose((((((X|X) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) |transpose(X,-7) ) +(arpeggio(X) |X) ) ,-5) ) ,-5) +transpose(arpeggio(step(((((shuffle(transpose(X,-7) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) |transpose(X,-5) ) |transpose((shuffle(X) +(arpeggio(X) |(X+transpose(X,7) ) ) ) ,-5) ) +transpose((transpose(transpose(X,4) ,-7) +(((shuffle(X) +transpose(arpeggio(X) ,7) ) +transpose((X|(X+transpose(X,7) ) ) ,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) ) ,-7) ) ,12) ) ,12) ) ,4) )
random seed used was 0


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