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:
((arpeggio((((echo((((transpose(X,-5) |transpose(X,-7) ) +transpose(transpose(echo(X,4,6) ,-5) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) +transpose(transpose((transpose(X,-7) +transpose(((X|X) +step(X,12) ) ,12) ) ,4) ,12) ) +transpose(echo((step(transpose(echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ,-7) ,12) |((transpose((X+transpose(X,4) ) ,4) +transpose((X+transpose(X,12) ) ,12) ) +transpose(arpeggio(echo(((X+transpose(X,7) ) +transpose(X,7) ) ,4,6) ) ,12) ) ) ,4,6) ,4) ) +transpose((echo(echo(X,4,6) ,4,6) +(transpose(arpeggio(step(X,12) ) ,-5) +arpeggio(X) ) ) ,7) ) ) +transpose(((transpose(((shuffle(X) +transpose(echo(((X+transpose(X,12) ) +transpose(X,7) ) ,4,6) ,12) ) +transpose(shuffle(((X+X) +transpose((X+X) ,7) ) ) ,12) ) ,-7) +transpose(transpose(shuffle(arpeggio(transpose(((((X+transpose((X+X) ,7) ) |X) +transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-7) ,12) ) |transpose((arpeggio(step(X,12) ) +transpose((transpose(X,-5) |shuffle(X) ) ,4) ) ,-7) ) ,-7) ) ) ,-5) ,4) ) +transpose(((((echo(arpeggio(X) ,4,6) +transpose(X,7) ) |((transpose((X+transpose(X,12) ) ,-7) +transpose(transpose((X+X) ,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose((X+transpose(transpose(((X+transpose((X+transpose(X,7) ) ,12) ) +arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-7) ,12) ) ,7) ) +transpose(transpose(transpose(step(step((X+transpose((X+transpose(X,12) ) ,7) ) ,12) ,12) ,-5) ,-5) ,7) ) ,7) ) ,7) ) +transpose(echo((transpose((arpeggio(transpose(echo(transpose(transpose((X+X) ,-7) ,4) ,4,6) ,4) ) +arpeggio((transpose(echo((X+transpose(X,7) ) ,4,6) ,4) |arpeggio(((X|X) |(transpose(X,4) +(X+transpose(X,7) ) ) ) ) ) ) ) ,-7) +transpose(((arpeggio(((step((X|X) ,12) |(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) |shuffle(((transpose((((X|X) +transpose(X,12) ) +step((X+X) ,12) ) ,4) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ,4) ) +transpose(transpose(transpose(((X+transpose(X,7) ) +transpose((X+X) ,12) ) ,-5) ,4) ,7) ) ) ) ) +(transpose((transpose(X,-5) |(X|X) ) ,-5) +transpose((transpose(transpose(transpose((X+X) ,4) ,-7) ,-5) +shuffle(transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) ) ,7) ) ) +transpose((shuffle(transpose(((shuffle(X) +transpose(arpeggio(transpose((X|X) ,-5) ) ,7) ) |(((X+transpose(X,7) ) +transpose(step(step(X,12) ,12) ,12) ) +arpeggio(transpose(X,-7) ) ) ) ,-7) ) +arpeggio(transpose(transpose(((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,-7) ,4) ) ) ,12) ) ,12) ) ,4,6) ,12) )
random seed used was 59177543 EXPR = shuffle(((transpose(step(((transpose((transpose(arpeggio(echo(transpose(((X|(X+X) ) +shuffle((X|X) ) ) ,-5) ,4,6) ) ,-7) +transpose(((shuffle(shuffle(((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) ,-7) |transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,-5) ) +arpeggio((X+transpose(X,4) ) ) ) ) ) +transpose((shuffle(step((transpose((X+transpose(X,7) ) ,4) +transpose((X|X) ,12) ) ,12) ) |transpose(((transpose(X,-5) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) ,4) ) +transpose(((step((((transpose(((X+transpose((X+transpose(X,12) ) ,12) ) +transpose(step(X,12) ,-7) ) ,-7) |transpose((X|X) ,-7) ) +transpose(echo((((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +(X+(X+X) ) ) ,4,6) ,4) ) +transpose(shuffle((X+X) ) ,7) ) ,12) +transpose((transpose((X|arpeggio((X+transpose(X,7) ) ) ) ,4) |(transpose(X,-5) +transpose(transpose(transpose((X+X) ,-5) ,4) ,12) ) ) ,4) ) +transpose((((transpose(X,-5) |transpose(transpose(X,4) ,4) ) |transpose(transpose(transpose(X,4) ,-5) ,-5) ) +transpose(transpose(step(X,12) ,4) ,7) ) ,7) ) ,7) ) ,12) ) ,-7) +transpose(arpeggio(((((transpose((transpose(X,-5) +transpose(X,12) ) ,-5) +transpose((echo(echo(transpose(X,-5) ,4,6) ,4,6) +transpose((transpose(((X|X) +transpose((X+X) ,12) ) ,-7) +transpose((transpose(X,-7) +(X+transpose(X,12) ) ) ,12) ) ,4) ) ,7) ) +transpose(shuffle((echo((((X|X) +transpose((X+transpose(transpose(X,-5) ,12) ) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,12) ) ,4,6) |((transpose((X+X) ,-7) +transpose((X+(X|X) ) ,7) ) +transpose((transpose(X,4) +transpose(X,-7) ) ,7) ) ) ) ,7) ) +transpose((((((step(X,12) +(X|X) ) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) +transpose(transpose(shuffle(arpeggio(X) ) ,-7) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose((((transpose(X,4) |arpeggio(X) ) +(transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose(echo(transpose(((transpose(X,4) +transpose(step(shuffle(X) ,12) ,4) ) +transpose(step(X,12) ,7) ) ,-7) ,4,6) ,7) ) ,7) ) ,4) ) |transpose(transpose((echo(((transpose(X,-5) +transpose(X,12) ) |(arpeggio(X) +transpose((X+X) ,12) ) ) ,4,6) +transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,-5) ,7) ) ,4) ,-7) ) ) ,4) ) +transpose(arpeggio(transpose((transpose((transpose((X+arpeggio(X) ) ,4) +echo((X+transpose((echo((X+transpose(X,12) ) ,4,6) +echo(X,4,6) ) ,12) ) ,4,6) ) ,4) +echo((step((arpeggio(X) +(X+transpose(X,4) ) ) ,12) +echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) ) ,4,6) ) ,-7) ) ,7) ) ,12) ,-7) +transpose((transpose(transpose(transpose(transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +(X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) ,4) ,4) ,-7) +transpose(transpose((arpeggio((((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(echo(((X+transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) |transpose(arpeggio(X) ,4) ) ) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,4) ,12) ) ,4) ,7) ) ,-5) ) +transpose(step((echo(shuffle(transpose(((((transpose(echo(X,4,6) ,-5) +transpose((transpose(transpose(X,4) ,-5) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose(echo(((X+transpose(X,7) ) |X) ,4,6) ,7) ) +transpose((shuffle(X) +transpose(shuffle((step(X,12) |((X+transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ) ,7) ) ,4) ) +transpose((echo(transpose((X|X) ,4) ,4,6) +transpose((transpose(X,-7) +transpose((transpose(X,-5) +transpose(((X+transpose(X,7) ) |transpose(X,4) ) ,7) ) ,12) ) ,12) ) ,7) ) ,-5) ) ,4,6) +arpeggio(step(transpose(transpose((transpose(X,4) |X) ,-7) ,4) ,12) ) ) ,12) ,12) ) )
random seed used was 0 EXPR = transpose(transpose(shuffle(transpose(echo((arpeggio(shuffle((transpose(echo(shuffle(step((X+transpose(X,12) ) ,12) ) ,4,6) ,-7) |transpose(((((step((transpose(X,-7) +transpose(((X|X) +transpose(transpose(X,4) ,12) ) ,12) ) ,12) |(transpose(X,4) |transpose(arpeggio(X) ,-5) ) ) |transpose(transpose(arpeggio(X) ,-5) ,4) ) +transpose(transpose(transpose(transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,-5) ,4) ,7) ) |transpose((X+transpose((X+X) ,7) ) ,4) ) ,4) ) ) ) |echo((((transpose(((echo(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) +transpose((transpose(echo(arpeggio(X) ,4,6) ,-5) |transpose(X,4) ) ,4) ) +transpose((transpose(arpeggio((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) +transpose((((transpose(arpeggio(X) ,-5) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) |transpose(transpose(X,-5) ,-5) ) ,12) ) ,7) ) ,-5) +transpose((transpose(echo((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,-5) +((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose((X|(X|X) ) ,12) ) |((step((X+transpose(X,12) ) ,12) +transpose((X+transpose(X,4) ) ,4) ) +transpose(transpose(arpeggio(step(X,12) ) ,4) ,7) ) ) ) ,12) ) +transpose((((arpeggio(transpose(((transpose(X,4) +transpose(X,7) ) +transpose(X,4) ) ,4) ) +transpose(step((transpose(X,-5) +transpose(X,12) ) ,12) ,12) ) |((((transpose(transpose(X,4) ,-5) +transpose((X+transpose(transpose((X|X) ,-7) ,12) ) ,4) ) +transpose((arpeggio(((X+transpose(X,12) ) +transpose(X,-5) ) ) +transpose((echo(transpose((X|X) ,4) ,4,6) |transpose(((X|X) +transpose(X,-5) ) ,-7) ) ,12) ) ,7) ) +transpose(echo(transpose((X+transpose(transpose(X,-5) ,7) ) ,4) ,4,6) ,4) ) +transpose((transpose((step(X,12) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(step(X,12) ,7) ) ) ,4) +transpose((X|transpose(X,-5) ) ,7) ) ,7) ) ) +transpose(transpose(transpose(step((((transpose(((X|X) +step(X,12) ) ,4) +shuffle((X+transpose(X,7) ) ) ) +transpose(transpose((echo(step(X,12) ,4,6) +echo(X,4,6) ) ,-7) ,4) ) +transpose(arpeggio((X+transpose(((X+X) +(X+X) ) ,7) ) ) ,7) ) ,12) ,4) ,4) ,12) ) ,4) ) +transpose((transpose(((X|transpose(X,-5) ) +transpose(transpose(transpose(((transpose(X,-7) +transpose(X,4) ) +transpose((X|X) ,7) ) ,-7) ,4) ,12) ) ,4) +transpose(transpose((transpose((step(echo(X,4,6) ,12) |transpose(transpose(X,-5) ,-7) ) ,-7) +transpose(step(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,12) ,7) ) ,-5) ,7) ) ,7) ) ,4,6) ) ,4,6) ,-5) ) ,4) ,4)
random seed used was 0

NOTE: Generated phrase was too large ( 18880 ) , it has been truncated at 5000 notes.


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