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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(shuffle((transpose(((((transpose(((shuffle((X+X) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,-7) ) ,12) ) +transpose(transpose(arpeggio(echo((transpose(X,-7) +transpose(((X+transpose(X,7) ) +(X+transpose(X,12) ) ) ,12) ) ,4,6) ) ,4) ,7) ) ,-7) +transpose(shuffle(transpose(transpose(transpose(transpose(X,4) ,-5) ,-5) ,4) ) ,4) ) +transpose((transpose(arpeggio((transpose(shuffle(transpose(X,-5) ) ,-7) |transpose((X+X) ,4) ) ) ,4) |((echo((((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(transpose(X,-5) ,7) ) |(step(X,12) +transpose(shuffle(arpeggio(X) ) ,7) ) ) ,4,6) +transpose((((X+transpose(X,12) ) +transpose(shuffle(X) ,4) ) +transpose(shuffle(X) ,7) ) ,-7) ) |(transpose(step((shuffle((X|X) ) +transpose(((X|X) +shuffle(X) ) ,7) ) ,12) ,-5) +(transpose(X,-5) +transpose(step(transpose(transpose(X,-5) ,-5) ,12) ,7) ) ) ) ) ,7) ) +transpose((echo((transpose(transpose((arpeggio(transpose((X+X) ,-5) ) +transpose(X,-5) ) ,-7) ,-7) +transpose(transpose(transpose(shuffle(shuffle((((X+transpose(shuffle(X) ,7) ) +(X|X) ) +(echo((X+transpose(X,12) ) ,4,6) +transpose((X+transpose(X,7) ) ,4) ) ) ) ) ,-5) ,-7) ,12) ) ,4,6) +transpose(((transpose(transpose((transpose(X,-5) +(X+transpose(arpeggio(X) ,12) ) ) ,4) ,-5) +transpose(((echo(transpose(transpose((X+X) ,-7) ,-5) ,4,6) +transpose((X+echo(X,4,6) ) ,4) ) +transpose((echo(((X+X) +transpose(X,7) ) ,4,6) +transpose(transpose(transpose(X,-5) ,4) ,4) ) ,7) ) ,7) ) |(arpeggio((((transpose(transpose(step(X,12) ,4) ,-7) +transpose(transpose(shuffle(X) ,4) ,12) ) +transpose(((((arpeggio((X|X) ) +(X+transpose(X,12) ) ) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |arpeggio(transpose(X,-7) ) ) ,12) ) |transpose(((X+transpose((X+transpose(step((X|X) ,12) ,12) ) ,4) ) +transpose(transpose(((arpeggio(X) +transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose((X+X) ,7) ) ,4) ,7) ) ,-5) ) ) +transpose((transpose(transpose((transpose(X,-5) |arpeggio(X) ) ,-7) ,-5) +transpose((arpeggio(arpeggio(X) ) |transpose((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) ,-7) ) ,7) ) ,12) ) ) ,7) ) ,4) ) +transpose(((((transpose(arpeggio(((arpeggio(X) +(X+X) ) +arpeggio((((X+X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ) ) ,-5) +transpose(transpose(transpose(step(transpose(X,-7) ,12) ,-7) ,-5) ,4) ) +transpose(arpeggio(((echo(step(X,12) ,4,6) |echo(X,4,6) ) +transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +arpeggio(X) ) ,4) +transpose(shuffle((X+transpose(X,12) ) ) ,12) ) ,7) ) ) ,7) ) +((transpose((((transpose(shuffle(X) ,-7) +transpose(transpose(transpose((X+X) ,4) ,4) ,-7) ) +transpose((echo((X+X) ,4,6) +transpose(shuffle((((X+transpose(X,12) ) +transpose(X,-5) ) |echo(X,4,6) ) ) ,12) ) ,7) ) +transpose((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |(X|(X|X) ) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(shuffle(transpose((X|X) ,-5) ) ,12) ) ,-7) ) ,-7) +transpose((((step(arpeggio(step(X,12) ) ,12) +transpose(((((X+transpose(transpose(X,-5) ,12) ) +transpose(transpose(transpose((X|X) ,-5) ,-5) ,4) ) +transpose(transpose((echo(X,4,6) +transpose(transpose(X,4) ,7) ) ,-5) ,7) ) |(echo(transpose((X+X) ,-7) ,4,6) +transpose((transpose((X+transpose(X,12) ) ,4) +transpose(transpose(transpose(shuffle(X) ,-7) ,4) ,7) ) ,12) ) ) ,12) ) +transpose(transpose(transpose(((X+transpose(X,12) ) |X) ,4) ,-7) ,4) ) +transpose(transpose((echo((X|X) ,4,6) |(transpose((X+transpose(X,12) ) ,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ,7) ) ,4) ) +transpose(step((step((transpose((X|X) ,4) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,12) |arpeggio((step(X,12) +transpose(X,4) ) ) ) ,12) ,7) ) ) +(((((((transpose(X,4) +X) +transpose(arpeggio(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) +(transpose((X+X) ,4) |((X|X) +X) ) ) +transpose((echo((step(transpose(X,4) ,12) +transpose(step((X+X) ,12) ,7) ) ,4,6) +transpose(shuffle(echo((X|echo(X,4,6) ) ,4,6) ) ,7) ) ,4) ) +transpose((((transpose(X,4) +X) +transpose(transpose(X,-5) ,7) ) +transpose(transpose(echo(transpose(X,-7) ,4,6) ,-5) ,7) ) ,7) ) +(((step(transpose(X,4) ,12) +transpose(transpose((X+echo(X,4,6) ) ,-5) ,7) ) +echo(transpose(X,4) ,4,6) ) |arpeggio(transpose(transpose(transpose(X,-5) ,-5) ,-7) ) ) ) +transpose(echo(shuffle((step(X,12) |echo(X,4,6) ) ) ,4,6) ,12) ) ) ,7) ) ,-5) +arpeggio(transpose(transpose((step(((X+transpose(shuffle(X) ,12) ) +transpose(transpose((step(X,12) +X) ,-5) ,7) ) ,12) +transpose(echo(((((((((((transpose(transpose(X,-7) ,-7) +transpose((X|X) ,4) ) +transpose(X,7) ) +arpeggio(shuffle(X) ) ) +transpose(transpose((X+transpose(X,-5) ) ,-7) ,4) ) +transpose((((arpeggio(X) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose((X+X) ,4) ) ,7) ) +transpose(transpose((X|X) ,-5) ,4) ) +transpose(((X+transpose(transpose(X,4) ,12) ) |echo(((X+transpose(X,7) ) |echo(X,4,6) ) ,4,6) ) ,4) ) +transpose(((arpeggio((transpose(X,-7) +transpose(shuffle(X) ,12) ) ) +transpose(transpose((X+X) ,4) ,4) ) +transpose(transpose((step(X,12) +step(X,12) ) ,4) ,7) ) ,7) ) +transpose(transpose((echo(transpose(((transpose(X,4) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,-5) ,4,6) |(transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) +((arpeggio(X) +transpose(transpose(X,-7) ,4) ) +transpose(((X+transpose(X,7) ) +X) ,7) ) ) ) ,4) ,4) ) +transpose(arpeggio(echo(echo(shuffle(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,4,6) ,4,6) ) ,7) ) ,4,6) ,12) ) ,-5) ,4) ) ) ) ,-5) random seed used was 145014301
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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