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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 20 generations the expression "X" became this: | transpose(((step(transpose(transpose(step(((transpose((step(X,12) +(X+X) ) ,-7) |step((transpose((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) ,4) +transpose((((X|X) |X) +(((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ,7) ) ,12) ) |(transpose(transpose(step(X,12) ,4) ,4) |shuffle(((((transpose(shuffle(X) ,4) +transpose(shuffle(((echo(X,4,6) +transpose(arpeggio(X) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,7) ) |(shuffle((X+X) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,12) ) ) |transpose(transpose(echo(X,4,6) ,-7) ,-7) ) +transpose((transpose(transpose(step(X,12) ,-5) ,-7) |step((transpose(X,4) +X) ,12) ) ,12) ) ) ) ) ,12) ,4) ,4) ,12) +transpose((((arpeggio((transpose(step(transpose(X,-5) ,12) ,-5) |(transpose(transpose(X,-7) ,4) +transpose((((transpose(X,-5) +transpose((transpose(X,-7) +X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +(X|(X+transpose(X,12) ) ) ) ,7) ) ) ) +transpose(((((((((arpeggio(transpose((X+transpose(X,12) ) ,-5) ) +transpose(step(X,12) ,4) ) +transpose((shuffle(X) +(X+X) ) ,7) ) +transpose(transpose(((transpose(shuffle(X) ,-7) |transpose(arpeggio(X) ,-5) ) |((X+X) +X) ) ,4) ,4) ) +transpose(transpose(((X+X) +transpose(((X|X) +transpose((X|X) ,7) ) ,7) ) ,-5) ,7) ) +transpose(arpeggio(transpose((X|(X+(X+transpose(X,12) ) ) ) ,-7) ) ,-5) ) +transpose((transpose(((X+arpeggio(X) ) |X) ,-5) |echo((X+transpose((X|X) ,12) ) ,4,6) ) ,4) ) +transpose((((X+X) +transpose(transpose(X,-5) ,7) ) |step(transpose((X+transpose(X,7) ) ,4) ,12) ) ,7) ) +transpose(transpose(transpose(((step(echo(X,4,6) ,12) |((X|X) |transpose(X,-5) ) ) +transpose(transpose(((arpeggio(X) +transpose(X,7) ) |(((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ) ,4) ,7) ) ,4) ,-7) ,12) ) ,12) ) +transpose((arpeggio(transpose((transpose(transpose((X|arpeggio(X) ) ,-5) ,4) +transpose(step(echo(arpeggio(((shuffle(X) +X) +(X|X) ) ) ,4,6) ,12) ,12) ) ,-5) ) +transpose(transpose((((transpose(X,-7) +X) +transpose(arpeggio(((transpose((transpose(X,-7) +transpose(arpeggio(X) ,12) ) ,-5) +transpose((step((X|X) ,12) |(X+transpose(X,-7) ) ) ,4) ) +transpose(transpose((arpeggio(X) +transpose(X,12) ) ,4) ,7) ) ) ,7) ) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ,-7) ,7) ) ,4) ) +transpose((echo(transpose(step(transpose(transpose((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose((X|X) ,7) ) ,-5) ,-5) ,12) ,-7) ,4,6) +transpose(((transpose(((transpose(X,4) +arpeggio(transpose(X,4) ) ) +transpose((shuffle((((X+X) +transpose((X+X) ,7) ) +transpose((X+transpose(X,7) ) ,12) ) ) +transpose((X+X) ,-5) ) ,-5) ) ,-7) +transpose(shuffle((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) ) ,4) ) +transpose(echo(transpose(transpose((transpose(arpeggio(step(X,12) ) ,-7) +transpose((X+transpose(transpose(X,4) ,-5) ) ,7) ) ,-5) ,4) ,4,6) ,7) ) ,12) ) ,7) ) ,-7) ) +transpose((((transpose(transpose((arpeggio(echo(X,4,6) ) |arpeggio(transpose((X+transpose(X,12) ) ,4) ) ) ,-5) ,4) |transpose(transpose((((step((X+transpose(X,12) ) ,12) +transpose(echo(transpose(transpose((X|X) ,-7) ,4) ,4,6) ,4) ) +transpose(X,7) ) +transpose(((((X+transpose(X,7) ) +transpose((X+X) ,7) ) +X) |transpose(transpose(X,-7) ,-7) ) ,12) ) ,-7) ,-7) ) +transpose(transpose((((shuffle((X|X) ) |arpeggio(transpose(((transpose(shuffle(shuffle(X) ) ,-7) |transpose(X,-7) ) +echo(transpose(X,-5) ,4,6) ) ,-5) ) ) +shuffle((shuffle(step((transpose(arpeggio(echo(X,4,6) ) ,-7) |transpose(transpose((X+transpose(X,7) ) ,4) ,4) ) ,12) ) +arpeggio(echo(echo((X|X) ,4,6) ,4,6) ) ) ) ) |(transpose(arpeggio(echo((step(step(X,12) ,12) +transpose(echo(X,4,6) ,7) ) ,4,6) ) ,-7) |transpose(transpose((transpose(transpose(transpose(transpose((transpose(X,4) +transpose(X,7) ) ,4) ,4) ,-7) ,-5) +transpose(transpose((((((X+X) +transpose(X,4) ) +transpose((X|X) ,7) ) +((X+transpose(transpose(X,4) ,12) ) +transpose(X,7) ) ) +step((arpeggio(transpose(X,-7) ) +(X+X) ) ,12) ) ,-7) ,4) ) ,-5) ,-5) ) ) ,-5) ,4) ) +transpose(((((transpose(step(X,12) ,-5) +transpose(echo(arpeggio(((((X|(X+(X+X) ) ) |(transpose(transpose(X,4) ,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) |transpose((transpose((X+transpose(X,7) ) ,4) +transpose((transpose(X,4) +X) ,12) ) ,4) ) +transpose(transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,4) ,-5) ,7) ) ) ,4,6) ,4) ) +transpose((((shuffle((((shuffle(X) +transpose(X,-7) ) +transpose(X,-5) ) |((transpose(X,4) |X) |(X+X) ) ) ) |echo((X|((X+X) +X) ) ,4,6) ) +((shuffle(transpose(step((transpose(X,-5) |X) ,12) ,4) ) +transpose(((transpose(transpose((X+transpose(X,12) ) ,-7) ,4) +X) |(((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(shuffle(X) ,-7) ) ) ,4) ) +transpose((X+(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) |transpose(X,-5) ) ) ,7) ) ) +transpose(step(transpose(transpose(step((X+transpose((X+X) ,7) ) ,12) ,4) ,-7) ,12) ,7) ) ,7) ) |transpose(transpose((shuffle(((transpose(X,-7) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) +transpose(transpose(shuffle((X+transpose(X,12) ) ) ,-7) ,12) ) ,-7) ,4) ) |((shuffle(transpose(transpose(transpose(X,4) ,-5) ,-5) ) +(((((X+transpose(transpose(step(X,12) ,-7) ,7) ) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ,4) ) +transpose((transpose(((arpeggio((X+X) ) +transpose(X,12) ) +echo(X,4,6) ) ,-7) +transpose((transpose(arpeggio(shuffle(X) ) ,4) +transpose(shuffle(arpeggio(X) ) ,12) ) ,7) ) ,4) ) +transpose((transpose(transpose((((X+transpose(X,12) ) |echo(transpose(X,-5) ,4,6) ) +((X|X) |arpeggio(X) ) ) ,-5) ,4) +echo(transpose((X+X) ,-5) ,4,6) ) ,7) ) +transpose(step((((transpose(X,-7) |(X+transpose(X,7) ) ) +step(transpose(X,-5) ,12) ) +echo(X,4,6) ) ,12) ,4) ) ) +echo(((transpose(step(echo(transpose((((transpose(X,4) |(X|X) ) +transpose(shuffle((X+X) ) ,4) ) +transpose(((X+X) +arpeggio(X) ) ,7) ) ,-5) ,4,6) ,12) ,-7) +transpose(transpose(transpose(((X|X) +transpose((shuffle(X) +transpose((echo(X,4,6) +transpose(transpose(X,-7) ,12) ) ,12) ) ,7) ) ,-7) ,-5) ,4) ) +transpose(arpeggio(shuffle(arpeggio(X) ) ) ,7) ) ,4,6) ) ) ,7) ) ,-7) ) ,4) random seed used was 232487540
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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