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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(((transpose(transpose(((transpose(((((transpose(X,4) +transpose((arpeggio(X) +transpose(echo(X,4,6) ,12) ) ,4) ) +transpose((((X+X) +transpose((X|X) ,7) ) +transpose(X,7) ) ,7) ) +((transpose((arpeggio(X) +transpose((X|X) ,12) ) ,-5) |(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose((((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,12) ) ,7) ) ) |(arpeggio((transpose(X,-7) +transpose(X,12) ) ) +transpose((transpose(X,-5) |shuffle(echo(transpose(X,-5) ,4,6) ) ) ,12) ) ) ) +transpose((arpeggio(transpose(shuffle(X) ,4) ) +transpose((transpose(transpose((arpeggio(X) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,-7) ,-5) +transpose((((X+transpose((X+X) ,12) ) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ,12) ) ,12) ) ,12) ) ,-5) |transpose((transpose(((transpose((X+transpose(X,12) ) ,4) +transpose(((((transpose(X,4) |arpeggio(X) ) +transpose((((X+X) +transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(step(step((X+transpose(X,7) ) ,12) ,12) ,7) ) ,4) ) +transpose(((step((transpose((X+X) ,4) |((X+transpose(X,7) ) +transpose(arpeggio(step(X,12) ) ,7) ) ) ,12) +transpose((echo(transpose((X+X) ,-7) ,4,6) |echo((echo(transpose(X,-7) ,4,6) +transpose((shuffle(X) +transpose(X,12) ) ,12) ) ,4,6) ) ,4) ) +transpose((((echo(X,4,6) +transpose(X,12) ) |shuffle(echo(X,4,6) ) ) |((shuffle((X|X) ) |((X+X) |transpose(X,-7) ) ) +transpose(transpose(X,4) ,7) ) ) ,7) ) ,7) ) ,4) +step((shuffle(echo(shuffle((X|X) ) ,4,6) ) |(echo(echo((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(X,4) ) ,4,6) ,4,6) +arpeggio((transpose(X,-7) |echo(transpose(X,-5) ,4,6) ) ) ) ) ,12) ) ,4) ) |(transpose((echo(step(step((X|X) ,12) ,12) ,4,6) +(((((transpose(X,-5) |step((X+X) ,12) ) +transpose((((arpeggio(arpeggio(X) ) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,12) ) |transpose(step((X+X) ,12) ,4) ) |transpose((transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) |transpose((transpose(X,4) +shuffle(X) ) ,4) ) ,-7) ) ,4) ) +transpose(arpeggio(transpose(transpose(transpose((X|X) ,-7) ,-7) ,-7) ) ,7) ) +transpose((transpose(shuffle((transpose(X,-5) |(X+(X|X) ) ) ) ,4) |((transpose(arpeggio(((X+X) +step(X,12) ) ) ,4) +transpose(echo(((X+transpose(X,7) ) +X) ,4,6) ,4) ) +transpose((echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) +arpeggio(X) ) ,7) ) ) ,12) ) +transpose((((((X+transpose((transpose(X,-7) +step(step(X,12) ,12) ) ,7) ) +transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) ,-5) ,7) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose((transpose(X,-5) +(X+transpose(X,12) ) ) ,-5) ,12) ) ) +shuffle((echo(X,4,6) +transpose(transpose((X+shuffle(X) ) ,4) ,12) ) ) ) |transpose(X,-7) ) ,7) ) ) ,4) +transpose(transpose(transpose((transpose(((transpose(X,4) |X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) +((((transpose(X,-7) |transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(shuffle(X) ,4) ,7) ) |arpeggio(step((X+X) ,12) ) ) ) ,-5) ,-7) ,12) ) ) ,4) ,-5) +transpose(transpose(echo(((transpose(((X|(transpose(X,-5) +(X+transpose(X,7) ) ) ) +transpose((((transpose(X,-5) +X) |X) |arpeggio(transpose((X+transpose(X,12) ) ,-5) ) ) ,12) ) ,4) +transpose((shuffle(echo(arpeggio(arpeggio(X) ) ,4,6) ) +transpose(arpeggio(transpose((((X+X) +transpose(((X+transpose(X,12) ) |(X|X) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) ,12) ) ,12) ) +transpose(transpose(echo(arpeggio(((transpose(X,4) +X) +(shuffle(X) +transpose(X,7) ) ) ) ,4,6) ,-5) ,7) ) ,4,6) ,-5) ,7) ) +transpose(echo(transpose(((((shuffle((transpose((transpose((X+X) ,4) |echo(X,4,6) ) ,-5) +transpose((((X|X) +X) +transpose(arpeggio(X) ,12) ) ,12) ) ) +transpose(transpose(transpose((transpose(transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,-5) ,-5) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,-7) ,4) ,7) ) +shuffle(shuffle((shuffle(transpose(transpose(transpose((transpose(transpose(X,-5) ,4) |(X|X) ) ,-5) ,-5) ,-5) ) |transpose((X+transpose((X|X) ,12) ) ,4) ) ) ) ) +transpose(step((echo(step(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ,4,6) |transpose((((shuffle(transpose(echo(arpeggio(X) ,4,6) ,-5) ) +transpose(transpose(transpose(((X|((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ) +transpose((X|X) ,12) ) ,4) ,-5) ,4) ) +transpose(step((((transpose(transpose(echo(X,4,6) ,4) ,-7) +transpose(((shuffle((X+transpose(X,7) ) ) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose((transpose(X,4) +transpose(X,12) ) ,7) ) ,12) ) +((X+step(X,12) ) +transpose(((X+transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) ) |step(transpose(shuffle(X) ,4) ,12) ) ,12) ,7) ) +transpose(((transpose(step(X,12) ,-5) +transpose((transpose(X,-5) +transpose(X,7) ) ,12) ) |(transpose(((transpose(shuffle(X) ,-5) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,-5) +((step((X+transpose(X,-5) ) ,12) +transpose(transpose(arpeggio(transpose(X,4) ) ,-7) ,4) ) +transpose(transpose(echo(echo(X,4,6) ,4,6) ,-7) ,7) ) ) ) ,7) ) ,-5) ) ,12) ,7) ) |step(((echo((X+transpose(X,12) ) ,4,6) |(transpose((X+transpose(echo(X,4,6) ,7) ) ,-7) |transpose(transpose(X,-7) ,-7) ) ) +transpose(arpeggio((shuffle((transpose(X,4) |arpeggio(X) ) ) |((((X+transpose(((X+transpose(X,12) ) |X) ,12) ) +transpose((X+transpose((X|(X|X) ) ,7) ) ,4) ) +transpose(transpose(step(X,12) ,-5) ,7) ) +transpose(step(((arpeggio((X|X) ) +transpose((X|X) ,4) ) +transpose((X+X) ,7) ) ,12) ,12) ) ) ) ,7) ) ,12) ) ,4) ,4,6) ,12) ) ,-7) random seed used was 265143779
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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