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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: | (shuffle(transpose(((((arpeggio((((shuffle(shuffle((transpose(X,-5) +transpose(arpeggio(X) ,7) ) ) ) +((X|X) +echo(X,4,6) ) ) |((shuffle(X) +transpose(transpose(arpeggio(shuffle((X+transpose(X,7) ) ) ) ,-7) ,4) ) +transpose(arpeggio(X) ,7) ) ) |(transpose(X,4) |(transpose(arpeggio((X+X) ) ,-7) +(((echo(X,4,6) +transpose(echo(X,4,6) ,7) ) +transpose(arpeggio(X) ,12) ) +transpose(((((X+X) +transpose((transpose(X,-5) |(X|X) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,12) ) ) ) ) ) +step(((transpose((X+transpose((X+transpose(transpose(X,-7) ,12) ) ,7) ) ,-5) +transpose((arpeggio(echo(((transpose(((X|X) |(X|X) ) ,4) +transpose(((step(X,12) |(X+transpose(X,7) ) ) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(((X+transpose(transpose((X|X) ,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,4,6) ) +((transpose((X+X) ,4) +step(((X+transpose(X,-7) ) +X) ,12) ) |shuffle(transpose(transpose(((X+X) |(X|X) ) ,-7) ,-7) ) ) ) ,4) ) +transpose(transpose(echo(transpose(shuffle(echo((transpose(X,-5) +transpose((X+X) ,7) ) ,4,6) ) ,-7) ,4,6) ,-5) ,7) ) ,12) ) +(transpose(transpose(transpose(((transpose(X,4) +step(transpose(X,4) ,12) ) |transpose((X+echo(X,4,6) ) ,-5) ) ,4) ,-5) ,-7) |(((((((X+transpose(X,12) ) +transpose(X,7) ) +transpose(arpeggio(transpose(transpose(X,4) ,-7) ) ,4) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) +transpose((((echo(X,4,6) |echo(X,4,6) ) +(step(shuffle(X) ,12) +transpose(X,12) ) ) +(transpose(X,-7) +transpose(X,7) ) ) ,4) ) +transpose(step(X,12) ,7) ) |(arpeggio(echo(echo((arpeggio(transpose(X,-5) ) |shuffle(X) ) ,4,6) ,4,6) ) +transpose(((((X+transpose(X,-7) ) +transpose((X+(X+transpose(X,12) ) ) ,12) ) +step(transpose((transpose(X,-5) +transpose(transpose(X,4) ,12) ) ,4) ,12) ) +(echo(step((transpose(X,4) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,12) ,4,6) +transpose((transpose((X+(X+X) ) ,4) +transpose(((X+X) +echo(X,4,6) ) ,7) ) ,7) ) ) ,12) ) ) ) ) +transpose(((shuffle(step((((transpose((X+transpose(X,7) ) ,-5) |shuffle((X+transpose(X,-5) ) ) ) +(transpose(((X|X) +transpose(X,7) ) ,-7) +transpose((X|(((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) ) ,7) ) ) +transpose(((transpose((X+transpose(X,12) ) ,4) +transpose(transpose(X,4) ,4) ) +transpose((X+X) ,7) ) ,-7) ) ,12) ) +transpose(transpose(transpose(transpose(transpose(transpose(echo(X,4,6) ,-5) ,-7) ,-7) ,-7) ,-5) ,-7) ) +transpose(((arpeggio((shuffle(X) |(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ) +transpose(transpose((echo((X|X) ,4,6) +arpeggio((transpose(transpose((X|X) ,-7) ,4) +transpose(echo(X,4,6) ,7) ) ) ) ,4) ,7) ) |((((((transpose(X,-7) +(((X|X) +transpose((X+(X|X) ) ,4) ) +transpose(shuffle((X+X) ) ,7) ) ) |((transpose(X,-5) +transpose((X+transpose(X,7) ) ,7) ) +transpose(step(X,12) ,7) ) ) +(transpose((X+transpose(X,7) ) ,-5) +(shuffle(X) |transpose(X,-5) ) ) ) +transpose(echo(((transpose(X,4) +shuffle(X) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) |(transpose(((X+X) |transpose(X,4) ) ,4) +transpose((((((X+transpose(X,-5) ) |(X+(X+X) ) ) +transpose(transpose((arpeggio(X) +arpeggio(X) ) ,-7) ,7) ) +transpose(transpose((arpeggio((X+X) ) +X) ,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ) ) ,7) ) ,4) ) +transpose((transpose(transpose(((transpose((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) +(((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(X,-5) ) ) +transpose((step(X,12) +transpose((X|X) ,12) ) ,-7) ) ,-7) ,-7) |(transpose(((transpose(transpose(X,-5) ,4) +step(transpose(X,-5) ,12) ) +shuffle(X) ) ,-5) +((echo(transpose(step(X,12) ,-5) ,4,6) |(echo(X,4,6) +transpose(transpose(X,-7) ,7) ) ) |(shuffle(transpose(transpose((X+X) ,-5) ,-7) ) |(arpeggio(transpose(X,4) ) +((transpose(X,-5) |(X+X) ) +transpose(transpose((X+X) ,4) ,7) ) ) ) ) ) ) ,7) ) ,-5) ) +echo(((transpose(transpose(((step(transpose((((X+X) +transpose(X,-7) ) |X) ,4) ,12) +transpose((transpose(((X+transpose((X|X) ,4) ) +transpose((transpose(X,-5) +transpose((X+X) ,12) ) ,7) ) ,-7) |transpose(shuffle((X|(X|X) ) ) ,4) ) ,7) ) |(((step(((transpose(echo(X,4,6) ,4) +transpose((X|X) ,4) ) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) |transpose(step(X,12) ,4) ) +transpose(arpeggio(step(((step(X,12) +(X+transpose(X,12) ) ) +transpose((echo(transpose(X,-7) ,4,6) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ,7) ) ,7) ) ,12) ) ,4) ) +transpose(echo(transpose((X|transpose((X+transpose(X,4) ) ,4) ) ,-7) ,4,6) ,7) ) ) ,-5) ,4) +transpose((transpose((transpose(transpose(echo(arpeggio((echo((echo(X,4,6) +X) ,4,6) |transpose(X,-5) ) ) ,4,6) ,-5) ,-7) |echo((((((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,4) ) +transpose((X+X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |((X+transpose(X,7) ) |(X+transpose(X,12) ) ) ) +transpose(((shuffle(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose((X|X) ,-5) ,12) ) ,7) ) ,4,6) ) ,-5) +arpeggio((shuffle((arpeggio((shuffle(shuffle(transpose(X,4) ) ) |transpose((shuffle(X) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ) +transpose(((echo(echo((X|(X|X) ) ,4,6) ,4,6) |transpose(transpose(X,-7) ,4) ) |transpose(((echo(transpose(X,-5) ,4,6) +shuffle(X) ) |(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) |transpose(X,-7) ) ) ,-7) ) ,12) ) ) ) ,4) ) +transpose((transpose(transpose((((((transpose(X,-5) +X) +transpose((((X+transpose(step(X,12) ,4) ) +transpose(echo(X,4,6) ,7) ) |echo(X,4,6) ) ,4) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) +((transpose((X+X) ,4) +transpose((((shuffle(X) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose(transpose((transpose(X,4) +(X+transpose(X,12) ) ) ,-5) ,7) ) ,4) ) +transpose(transpose(((X+X) |X) ,-5) ,7) ) ) +transpose(((transpose(X,-7) +transpose((X|X) ,12) ) +transpose(X,12) ) ,-7) ) ,-5) ,-7) +transpose(step(transpose(transpose((transpose(((((X|X) +transpose(X,4) ) +transpose((X|X) ,7) ) |(step(X,12) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) +transpose(((((X+X) +transpose(transpose(X,-5) ,7) ) +transpose(echo((X|X) ,4,6) ,7) ) +((transpose(X,-5) +transpose((X|X) ,12) ) +transpose((X+transpose(((X+transpose(X,7) ) |(X+X) ) ,7) ) ,7) ) ) ,7) ) ,4) ,-5) ,12) ,12) ) ,7) ) ,4,6) ) random seed used was 217936055
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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