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 14 generations the expression "X" became this:
echo((((X|shuffle((transpose(X,-7) |(X+X) ) ) ) +transpose((((echo(transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,-5) ,4,6) |(transpose(X,-7) +transpose((X|X) ,7) ) ) +transpose(transpose((((X|X) +transpose(shuffle(X) ,12) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,4) ,12) ) ,-7) ,4) ) +transpose(((((((X|step(X,12) ) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) +transpose((X+X) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) |step(((echo(X,4,6) +transpose((X+transpose(X,-5) ) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,12) ) ,7) ) ,7) ) +transpose(transpose(arpeggio(arpeggio(echo(((echo((X+X) ,4,6) +transpose(((X|X) +(X+X) ) ,12) ) |(echo(step((echo(X,4,6) |(X+X) ) ,12) ,4,6) |echo((((X+transpose(X,4) ) +transpose(X,7) ) +arpeggio(shuffle(X) ) ) ,4,6) ) ) ,4,6) ) ) ,-5) ,12) ) ,4,6)
random seed used was 1367631

NOTE: Generated phrase was too large ( 5940 ) , it has been truncated at 5000 notes. EXPR = transpose(((shuffle(transpose((transpose(transpose(X,-7) ,4) +transpose(step(step(transpose(X,-7) ,12) ,12) ,7) ) ,-5) ) +transpose((echo(transpose(step(step(shuffle((X+transpose(shuffle(X) ,12) ) ) ,12) ,12) ,-5) ,4,6) +echo(((((((X+transpose(X,12) ) +transpose(X,12) ) |transpose(X,-7) ) |echo((transpose(X,4) +transpose(echo(X,4,6) ,12) ) ,4,6) ) |(X+transpose(transpose((X+X) ,-5) ,7) ) ) +arpeggio((step((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(arpeggio(X) ,-7) ,12) ) ,12) |transpose(transpose((transpose(step(X,12) ,4) |transpose(X,4) ) ,-7) ,-7) ) ) ) ,4,6) ) ,12) ) +transpose(shuffle(transpose((shuffle((step((transpose(X,-7) +transpose(transpose(X,4) ,12) ) ,12) |transpose(transpose((arpeggio(X) +arpeggio(X) ) ,-5) ,4) ) ) +transpose(transpose(((echo(shuffle(transpose(X,-7) ) ,4,6) |shuffle(transpose(X,-7) ) ) +(shuffle(X) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,4) ,12) ) ,-7) ) ,-5) ) ,4)
random seed used was 0 EXPR = (step(transpose((arpeggio((echo(X,4,6) |((X|X) |shuffle(arpeggio(X) ) ) ) ) +transpose(transpose((transpose(echo(X,4,6) ,4) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,-5) ) ,-7) ,12) +transpose(step((shuffle(arpeggio(transpose(step(((transpose(X,-7) +transpose((step(X,12) +transpose(X,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ,-5) ) ) +transpose((((step(transpose(X,4) ,12) |(transpose(transpose((X|X) ,4) ,4) +arpeggio(((transpose(X,-5) +transpose(X,4) ) |(transpose(X,-5) +shuffle(X) ) ) ) ) ) +transpose((transpose((((transpose(X,-5) +X) +transpose((arpeggio(X) |X) ,7) ) |((((X+X) +transpose(shuffle(X) ,12) ) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,-5) |shuffle(arpeggio(X) ) ) ,4) ) +transpose(transpose((((X+transpose(X,4) ) +(X+(transpose(X,-5) |transpose((X+transpose(X,12) ) ,-5) ) ) ) +transpose(X,4) ) ,4) ,7) ) ,7) ) ,12) ,12) )
random seed used was 0 EXPR = ((((((((((step(transpose(X,-5) ,12) +transpose(((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ,12) ) |transpose(transpose((X|X) ,4) ,-5) ) +transpose(((transpose(X,-7) |(step(X,12) |transpose(X,4) ) ) +transpose(((step((X+transpose(X,12) ) ,12) +transpose(transpose(X,-5) ,4) ) +transpose(((X|X) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,7) ) ,12) ) +transpose(transpose((transpose(arpeggio((transpose((X+transpose(X,7) ) ,-7) +transpose((X+transpose(shuffle(X) ,7) ) ,7) ) ) ,-5) +transpose(shuffle(((X+transpose(arpeggio(X) ,12) ) +X) ) ,7) ) ,4) ,4) ) +transpose(shuffle(shuffle((transpose((X+transpose(X,7) ) ,-7) +transpose((X|X) ,12) ) ) ) ,7) ) +transpose((transpose(shuffle((echo(((transpose(X,-7) |((X+transpose(X,4) ) +transpose(X,7) ) ) |(X+X) ) ,4,6) +transpose(((X+((X+transpose(X,12) ) |X) ) +transpose(((X+transpose(X,12) ) +X) ,12) ) ,12) ) ) ,-5) |transpose(transpose((step((X+transpose(X,7) ) ,12) +(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) ) |transpose((X+transpose(X,12) ) ,-5) ) ,4) |X) ) ,-7) ,4) ) ,12) ) +((((step((((transpose((step(X,12) +transpose(echo(transpose(X,4) ,4,6) ,12) ) ,4) +transpose(((X|X) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) ,12) ) ,12) ) +transpose((X|transpose(step(X,12) ,4) ) ,-5) ) |transpose((((X+transpose(X,4) ) |transpose(X,-7) ) |(transpose(X,-7) |shuffle(X) ) ) ,-5) ) ,12) +transpose(transpose(X,-5) ,4) ) +transpose((arpeggio(transpose(((transpose(X,-5) +X) |transpose(X,4) ) ,-5) ) +arpeggio((((step((transpose(X,4) +transpose(X,12) ) ,12) +echo(transpose(transpose(X,-5) ,-5) ,4,6) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) ,4) ,7) ) ) ) ,7) ) |(((((transpose(X,4) +X) +transpose(transpose(transpose(((X+X) +transpose(X,7) ) ,-7) ,4) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) +transpose(echo(step(transpose(((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) ,12) ,4,6) ,12) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((shuffle(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,7) ) ,-5) ,-7) ) ) +transpose((transpose(echo((arpeggio(echo(transpose(transpose(X,-5) ,-7) ,4,6) ) +transpose(step((X+X) ,12) ,4) ) ,4,6) ,4) +(step((transpose(echo(echo(X,4,6) ,4,6) ,-5) +transpose((((X+X) +transpose(step(X,12) ,7) ) +transpose((transpose(X,4) +transpose(X,12) ) ,12) ) ,7) ) ,12) |((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) |step(((X+transpose(X,12) ) +transpose(X,7) ) ,12) ) +arpeggio(((transpose(X,4) +transpose(arpeggio((transpose(step(X,12) ,4) +X) ) ,4) ) +transpose(echo(((((X+transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +(X|X) ) ,4,6) ,7) ) ) ) ) ) ,12) ) ) |shuffle(((((((shuffle(step(transpose(transpose(X,-7) ,-7) ,12) ) |(transpose(X,-5) +(X+X) ) ) +transpose(((((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) |(transpose(X,-5) +transpose(echo(X,4,6) ,7) ) ) +transpose(transpose((echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) |transpose(transpose(X,4) ,4) ) ,4) ,7) ) ,7) ) +transpose(arpeggio((transpose(((X+transpose(shuffle(X) ,7) ) +((X+transpose(transpose(X,-7) ,12) ) +(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,-7) |transpose((echo(transpose((X+transpose(X,12) ) ,-7) ,4,6) +transpose((transpose(X,-5) |transpose(X,-7) ) ,12) ) ,4) ) ) ,4) ) +transpose((((transpose(transpose(X,4) ,-5) +transpose((step((X|X) ,12) |(X+transpose(X,-5) ) ) ,7) ) +transpose(arpeggio(arpeggio(X) ) ,12) ) +(((transpose((X+transpose(X,12) ) ,-7) |transpose(X,-5) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(((X|X) +transpose(transpose(X,-7) ,7) ) ,4,6) ,7) ) ) ,7) ) +transpose((transpose(((((((X+transpose(shuffle(X) ,12) ) +transpose(transpose(X,4) ,4) ) +transpose((X+X) ,7) ) +transpose((X+transpose((X|X) ,12) ) ,12) ) +transpose((transpose((X+X) ,-5) +transpose(transpose(X,4) ,4) ) ,12) ) +transpose(step(((echo(transpose(X,4) ,4,6) +transpose((X+X) ,12) ) +(transpose((X+X) ,4) +transpose(step(X,12) ,12) ) ) ,12) ,7) ) ,4) |(echo((transpose(transpose(X,-5) ,-5) |transpose((X+X) ,4) ) ,4,6) |((transpose(echo(shuffle(X) ,4,6) ,4) +transpose(((transpose((X+X) ,-5) |echo(((X+transpose(X,7) ) +shuffle(X) ) ,4,6) ) +transpose(transpose((X+transpose(X,4) ) ,-7) ,12) ) ,4) ) +transpose((step(step(shuffle(X) ,12) ,12) +transpose(arpeggio((X+X) ) ,12) ) ,7) ) ) ) ,4) ) +transpose(echo(((step(arpeggio(shuffle(X) ) ,12) +transpose(transpose(X,-5) ,-7) ) +(((transpose(transpose(X,4) ,-5) +transpose(transpose(transpose(X,4) ,-5) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) |(X+transpose(X,7) ) ) ) ,4,6) ,7) ) ) ) +transpose(step((((step((shuffle((echo(step(X,12) ,4,6) +transpose(shuffle(X) ,7) ) ) |(step(X,12) +transpose(step((echo((X+X) ,4,6) +(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,12) ,12) ) ) ,12) |echo((((arpeggio(transpose(X,-7) ) +transpose((echo(X,4,6) +transpose(X,4) ) ,12) ) +transpose(((X|transpose(X,-5) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4) ) +transpose(transpose(transpose((transpose(shuffle(X) ,-5) +transpose(X,-5) ) ,-5) ,4) ,7) ) ,4,6) ) +transpose(step(echo((echo((transpose(X,4) |X) ,4,6) +transpose(X,7) ) ,4,6) ,12) ,12) ) |(((((((((transpose(((X|X) +(X|X) ) ,-7) +transpose((shuffle(((X+transpose(X,12) ) |step(X,12) ) ) +(transpose(X,-7) |transpose(X,4) ) ) ,12) ) |(X+transpose(step(X,12) ,12) ) ) +transpose(arpeggio((transpose(((X+transpose(X,-5) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,4) +transpose((transpose(X,-5) +transpose(echo((X|X) ,4,6) ,4) ) ,12) ) ) ,4) ) +transpose(shuffle((transpose((X+transpose(X,12) ) ,4) +transpose(X,7) ) ) ,7) ) |transpose(transpose((((X+X) +transpose(X,12) ) |((X+transpose(transpose(X,-7) ,12) ) +transpose(((step(X,12) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,-7) ) ) ,-7) ,4) ) +transpose(transpose(transpose(arpeggio(transpose(X,-7) ) ,-7) ,-5) ,4) ) +transpose(step(step((transpose(transpose((X+transpose(echo(X,4,6) ,7) ) ,-5) ,4) |step((X+transpose(X,12) ) ,12) ) ,12) ,12) ,7) ) +transpose(shuffle(shuffle(echo((transpose(echo(transpose(transpose(X,4) ,4) ,4,6) ,4) |step(shuffle((transpose(X,-7) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ) ,12) ) ,4,6) ) ) ,4) ) +transpose((echo(transpose(((arpeggio(transpose(shuffle(X) ,-5) ) |((X|X) |(transpose(X,-5) +transpose(step(X,12) ,7) ) ) ) +transpose((X+((transpose(X,-7) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) ,-7) ,4,6) +shuffle(transpose(step(((transpose(X,-7) +transpose((transpose(X,4) +transpose((X|X) ,12) ) ,7) ) +arpeggio(X) ) ,12) ,4) ) ) ,7) ) ) ,12) ,4) ) +transpose(step(echo(transpose(((((((transpose(X,4) |(transpose(X,-7) |(transpose(X,4) +echo(X,4,6) ) ) ) |transpose((transpose(X,4) |step(X,12) ) ,-7) ) +transpose((((X+transpose((X|transpose(X,4) ) ,7) ) |shuffle((X+transpose(X,7) ) ) ) +transpose((arpeggio(((X|X) +transpose((X+X) ,12) ) ) +transpose(transpose(transpose((shuffle(X) +(X+transpose(X,7) ) ) ,-5) ,-7) ,7) ) ,12) ) ,4) ) +transpose(transpose(transpose((arpeggio(X) +transpose((X+X) ,12) ) ,-5) ,-7) ,7) ) +transpose(transpose((shuffle((transpose(transpose((X|X) ,-5) ,4) +(X+transpose(X,7) ) ) ) |(transpose(((transpose(X,4) +(X|X) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ,-7) +transpose((echo(transpose(X,-5) ,4,6) +transpose((transpose(X,-5) |X) ,12) ) ,12) ) ) ,-7) ,4) ) +transpose(echo(((transpose(((X+transpose(X,7) ) +X) ,4) |arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X+X) ,12) ) ) ) |(X+transpose(transpose(X,-5) ,12) ) ) ,4,6) ,7) ) ,4) ,4,6) ,12) ,7) )
random seed used was 0


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