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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.
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After 14 generations the expression "X" became this: | (((((transpose(X,-5) +transpose(transpose((step(transpose(transpose(transpose(X,-5) ,-7) ,-7) ,12) +echo(((shuffle(X) +transpose(transpose(((X|X) +transpose(X,12) ) ,-5) ,4) ) +transpose(shuffle(X) ,7) ) ,4,6) ) ,4) ,12) ) +(((step((shuffle(X) +transpose(X,12) ) ,12) |((((arpeggio(X) +arpeggio(X) ) +(transpose(transpose(X,4) ,-5) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,7) ) ) +transpose(transpose(((X+X) +echo((X+transpose(X,12) ) ,4,6) ) ,4) ,4) ) +transpose(transpose((((X+transpose(X,12) ) |(X+X) ) |transpose(X,-5) ) ,-7) ,7) ) ) +transpose(transpose((((transpose(X,4) +transpose(((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(((transpose(transpose(X,4) ,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((transpose(X,-5) |transpose(X,4) ) ,7) ) ,7) ) +transpose(((shuffle(X) |(X|transpose(X,-5) ) ) +transpose((transpose((X|X) ,-5) +transpose((X+X) ,-7) ) ,12) ) ,7) ) ,-7) ,12) ) |(transpose((transpose((((X|X) +transpose(X,7) ) |((X+transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ) ,-5) +transpose(shuffle(echo(((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) ) ,7) ) ,-5) |(((echo(transpose(X,-7) ,4,6) +transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,-5) ,12) ) +transpose((shuffle((transpose(X,-5) |echo(X,4,6) ) ) +shuffle((transpose(X,-5) +arpeggio(X) ) ) ) ,7) ) +((transpose(step((X+X) ,12) ,-7) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ,4) ) +echo((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(step(arpeggio(X) ,12) ,7) ) ,4,6) ) ) ) ) ) +transpose(((shuffle(echo((((((X|(X+transpose(X,12) ) ) +transpose(X,4) ) +transpose(shuffle(X) ,4) ) |((transpose((step(X,12) +transpose(X,-5) ) ,-7) +transpose(shuffle(transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ) ,4) ) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ,7) ) ) |(transpose((step(X,12) +transpose((transpose(X,-7) +X) ,7) ) ,-5) +transpose((echo(shuffle((X+X) ) ,4,6) +echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,12) ) ) ,4,6) ) +transpose(transpose((((step((X+transpose(X,12) ) ,12) |arpeggio((X+(X+X) ) ) ) |transpose(transpose(arpeggio(transpose(X,-7) ) ,4) ,-7) ) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ,4) ,4) ) +transpose(arpeggio(arpeggio((step(transpose(transpose(X,4) ,-7) ,12) |transpose(X,4) ) ) ) ,7) ) ,4) ) +transpose(((((transpose((transpose(X,-5) +step(X,12) ) ,4) +transpose(((transpose(X,-5) +transpose((X+transpose(transpose(X,-5) ,7) ) ,4) ) +transpose((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,7) ) +transpose((((((transpose(X,4) +transpose(X,7) ) +(X+transpose((X|X) ,12) ) ) |(((((X+X) +transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((X+transpose(X,12) ) ,4) ) |echo(transpose((X+transpose(X,7) ) ,-5) ,4,6) ) ) +transpose(arpeggio(transpose(shuffle((X+transpose(X,12) ) ) ,4) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose((echo(arpeggio(echo(shuffle(X) ,4,6) ) ,4,6) |(((X+X) |(X+transpose(X,12) ) ) +transpose(((X+echo((X+transpose(X,7) ) ,4,6) ) +(transpose((X+X) ,4) +transpose(X,12) ) ) ,12) ) ) ,7) ) +transpose(transpose((step((shuffle(X) |step(X,12) ) ,12) +transpose(shuffle((shuffle(X) +transpose((arpeggio((X|X) ) +transpose(step((X+transpose(X,12) ) ,12) ,12) ) ,12) ) ) ,12) ) ,4) ,4) ) ,7) ) +transpose((((((transpose((shuffle(transpose(transpose(X,4) ,-7) ) |arpeggio((((X+transpose(transpose(X,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) +echo((X|transpose(X,4) ) ,4,6) ) ) ) ,-7) |(((transpose((((X|X) +transpose((X+transpose((X+X) ,12) ) ,12) ) |transpose(echo(X,4,6) ,-5) ) ,-5) |shuffle((X+transpose(X,12) ) ) ) +transpose(((transpose(((echo(X,4,6) |(transpose(X,-5) |X) ) +transpose(((X+X) +transpose((X+X) ,12) ) ,7) ) ,4) +transpose((echo(arpeggio(X) ,4,6) +transpose(transpose((transpose(X,4) +transpose(X,7) ) ,-7) ,7) ) ,4) ) +transpose(transpose(((transpose(shuffle(transpose(X,4) ) ,4) +transpose(transpose(X,-7) ,4) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ,-7) ,7) ) ,4) ) +transpose(arpeggio(echo(transpose(transpose(transpose(X,4) ,4) ,-7) ,4,6) ) ,7) ) ) +(shuffle((transpose(((step(X,12) |(X+X) ) +transpose(transpose((X+X) ,-7) ,12) ) ,-7) |echo((shuffle(X) +transpose(shuffle(echo(X,4,6) ) ,12) ) ,4,6) ) ) +(shuffle(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) |step((((transpose(X,-5) +transpose(X,-7) ) +transpose((transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose(((X+transpose(X,12) ) +shuffle((X+transpose(step(X,12) ,12) ) ) ) ,-7) ) ,12) ) ) ) +transpose(transpose((((((((transpose(((X+X) |transpose(X,-5) ) ,-7) |transpose(transpose(echo(X,4,6) ,-5) ,-7) ) +transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(shuffle(X) ,4) ,12) ) ,4) ) +transpose((transpose(X,-7) +transpose(transpose((X|X) ,-7) ,-7) ) ,7) ) +transpose(transpose((transpose(transpose(X,4) ,-5) +((transpose(X,-5) +X) |transpose(X,-5) ) ) ,-5) ,4) ) +transpose((transpose(step(X,12) ,4) +(transpose(X,-7) +transpose((X|transpose(X,-7) ) ,12) ) ) ,7) ) +transpose(step((((shuffle(X) +transpose(X,4) ) +transpose((echo(X,4,6) |X) ,7) ) +transpose(((((X+transpose(X,12) ) +transpose(X,12) ) +transpose((transpose(X,-5) |transpose(transpose(X,-5) ,4) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ,12) ,4) ) +transpose(shuffle(transpose(transpose(transpose(X,-7) ,4) ,-7) ) ,7) ) ,4) ,4) ) +transpose(((echo(shuffle(((transpose((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) |(transpose(X,4) +transpose(X,-7) ) ) |transpose(((X+transpose(X,7) ) +transpose(step(X,12) ,12) ) ,-5) ) ) ,4,6) +transpose(transpose(((transpose(step(X,12) ,4) +transpose(((X+X) +step(X,12) ) ,4) ) +transpose((X|X) ,7) ) ,-5) ,12) ) +((transpose(((X+transpose((X|X) ,4) ) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) |transpose(X,-5) ) ,7) ) ,-5) +transpose(step(arpeggio(((X+X) |(X+X) ) ) ,12) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ) ,7) ) |transpose(((transpose((transpose(arpeggio(X) ,4) |transpose(((((transpose(X,-7) +transpose(arpeggio(X) ,12) ) +transpose(transpose(X,-5) ,7) ) +transpose(transpose((X|X) ,-5) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,4) ) ,-7) |((transpose(transpose((transpose((step(X,12) +X) ,-7) +transpose(((transpose(X,4) +(X+X) ) |X) ,7) ) ,-7) ,-7) |transpose(shuffle(transpose(X,-7) ) ,4) ) +step((((transpose(transpose(X,-5) ,-5) +transpose(((X+transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,4) ) +transpose((transpose(X,4) +X) ,7) ) ,7) ) +((((X+transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(transpose((X|X) ,-5) ,7) ) ) +transpose(transpose(X,4) ,12) ) ,12) ) ) |((transpose(transpose(transpose(X,-7) ,4) ,4) +transpose((((((X+X) +transpose((X+X) ,12) ) +step(transpose(X,-7) ,12) ) +transpose((shuffle(X) +transpose(((X|X) +X) ,7) ) ,7) ) |step(echo(echo(X,4,6) ,4,6) ,12) ) ,12) ) +(transpose(transpose(((X+X) +(echo(X,4,6) +arpeggio(X) ) ) ,-5) ,4) |((transpose(transpose((X+X) ,-5) ,-5) |(((X+X) |arpeggio(transpose(X,-5) ) ) |step((transpose(X,4) +transpose(X,-5) ) ,12) ) ) +transpose(transpose((step(X,12) |X) ,-5) ,12) ) ) ) ) ,4) ) ,12) ) random seed used was 66563086
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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