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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(((echo(transpose((transpose((echo((((((echo(X,4,6) +transpose(step((X+transpose(X,12) ) ,12) ,12) ) +transpose(shuffle((transpose(step((X|X) ,12) ,-7) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,7) ) ) ,12) ) +transpose((((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ) +transpose(((transpose((X|X) ,-5) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) |echo(X,4,6) ) |(((X+transpose(X,7) ) +X) +transpose((X+X) ,-5) ) ) +transpose(transpose(shuffle(step(X,12) ) ,-5) ,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ,-5) ) |transpose(transpose((echo(shuffle((X+transpose(X,-5) ) ) ,4,6) +((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) +transpose(((shuffle(X) +(X+transpose(X,12) ) ) |X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,-7) ,4) ) ,4,6) +transpose(transpose(step((shuffle((X+(X|X) ) ) +transpose(transpose(step(X,12) ,4) ,7) ) ,12) ,-5) ,-5) ) ,-5) +transpose(arpeggio(transpose(echo((transpose(transpose(X,-5) ,4) |transpose(((X|X) |(X|X) ) ,-7) ) ,4,6) ,-7) ) ,-7) ) ,-5) ,4,6) +transpose((step(((transpose(step((transpose(X,-7) |(X+arpeggio(X) ) ) ,12) ,-7) +transpose(transpose((arpeggio((shuffle(X) +transpose((X+transpose(X,-7) ) ,12) ) ) +transpose((step(X,12) +transpose(step(transpose(X,-5) ,12) ,7) ) ,12) ) ,-7) ,7) ) +transpose(transpose((((transpose(echo((step(X,12) +(X|X) ) ,4,6) ,4) |(arpeggio((shuffle((X|X) ) +transpose(((X|X) +transpose(shuffle(X) ,12) ) ,7) ) ) +transpose(((X+transpose(transpose((X+X) ,4) ,-7) ) +shuffle((transpose(transpose(X,-5) ,-5) +transpose((X+X) ,7) ) ) ) ,12) ) ) +transpose(echo(((echo(transpose((X+X) ,4) ,4,6) +(transpose(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ,-5) +((X+transpose(X,7) ) |(X+(X+transpose(X,7) ) ) ) ) ) |transpose(step((X+X) ,12) ,-7) ) ,4,6) ,4) ) +transpose((((transpose(echo((transpose(X,4) +X) ,4,6) ,4) +transpose((transpose(arpeggio(transpose(X,-7) ) ,-7) +transpose(step((((transpose(X,4) +X) +transpose((transpose(X,-7) +transpose(X,4) ) ,4) ) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose((X+X) ,12) ) ,7) ) ,12) ,12) ) ,4) ) +transpose(shuffle(echo((((X+X) |(X+X) ) +transpose((transpose(X,-5) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) ,4,6) ) ,7) ) +((transpose((transpose(X,-5) +transpose(echo(X,4,6) ,12) ) ,-5) |arpeggio(step(X,12) ) ) +transpose(transpose((echo(X,4,6) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,4) ,7) ) ) ,7) ) ,4) ,7) ) ,12) +transpose(transpose(((transpose(echo(transpose(X,-7) ,4,6) ,-5) +transpose((echo(transpose(transpose(transpose(X,-7) ,4) ,-5) ,4,6) +step(echo(arpeggio(((echo(X,4,6) |transpose(X,-7) ) +transpose((transpose(shuffle(X) ,-7) |step((X|X) ,12) ) ,12) ) ) ,4,6) ,12) ) ,4) ) +transpose(transpose((shuffle((echo(shuffle(X) ,4,6) +transpose(((((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) +X) |transpose(X,-5) ) ,7) ) ) +(((transpose(((X+X) +step(X,12) ) ,4) +(transpose(transpose(X,-7) ,-7) +transpose((arpeggio(X) |X) ,12) ) ) +transpose((((transpose(transpose(X,-5) ,-7) +transpose((X+X) ,-7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(transpose(shuffle(X) ,-5) ,-5) ,7) ) ,4) ) +transpose(transpose(step(transpose(X,-5) ,12) ,-7) ,7) ) ) ,-5) ,7) ) ,4) ,12) ) ,4) ) +transpose(transpose(((transpose(((transpose((transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) |echo(transpose(step((transpose(X,4) +transpose(transpose((X+X) ,4) ,7) ) ,12) ,-5) ,4,6) ) ,-5) +transpose(step((transpose(shuffle(arpeggio((((arpeggio(X) +(step(X,12) |X) ) +transpose((X+transpose((X|X) ,12) ) ,-7) ) +transpose(transpose((X+X) ,-7) ,-7) ) ) ) ,-5) +transpose(transpose((((transpose(transpose((arpeggio(X) +transpose((X+transpose(X,7) ) ,12) ) ,-5) ,-7) +((((transpose(X,4) +(X+X) ) +X) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(((shuffle(step(X,12) ) +shuffle(X) ) |echo((X|X) ,4,6) ) ,12) ) |(((transpose(step(transpose(X,-7) ,12) ,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose((transpose(X,4) +transpose(X,12) ) ,-5) ) |((echo((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,4,6) +transpose(step(X,12) ,4) ) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,4) ,7) ) ) ) ,-5) ,7) ) ,12) ,4) ) +transpose(arpeggio((transpose(step(((transpose(X,-5) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,12) ,-5) +transpose(shuffle((((((X+transpose(X,12) ) +X) +transpose((X+transpose(X,7) ) ,-5) ) +transpose(((X+step(X,12) ) +transpose(transpose((X|X) ,-7) ,12) ) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ) ,4) ) ) ,7) ) ,4) +transpose((transpose(transpose(transpose(transpose(((X|X) +shuffle(transpose((X|X) ,-7) ) ) ,4) ,-7) ,-7) ,4) +transpose((transpose((((echo(((X+transpose(shuffle(X) ,7) ) +(X+transpose(transpose(X,-5) ,12) ) ) ,4,6) +echo(transpose((transpose(X,-7) +X) ,4) ,4,6) ) +(transpose(((X+X) +transpose(transpose(X,4) ,7) ) ,4) |((transpose(X,-5) +transpose(echo(X,4,6) ,7) ) +transpose(X,7) ) ) ) +step(((transpose(transpose(X,-5) ,4) |echo(((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +transpose(transpose((transpose(transpose(X,-5) ,-5) +(X+X) ) ,-7) ,7) ) ,12) ) ,-7) |arpeggio(transpose(transpose((transpose((X|X) ,-7) +X) ,-7) ,-7) ) ) ,12) ) ,4) ) +transpose(transpose(arpeggio((((transpose((transpose(step(echo((transpose(X,4) +transpose(X,12) ) ,4,6) ,12) ,-5) |(transpose((X+transpose(X,4) ) ,-5) |transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) ) ) ,-5) |(arpeggio(transpose((step(((X+X) |(X|X) ) ,12) +transpose(transpose(X,-7) ,7) ) ,-5) ) +transpose(transpose((step(((X|X) |transpose(X,4) ) ,12) |shuffle((transpose(X,-7) +transpose((X|transpose(X,-5) ) ,7) ) ) ) ,-5) ,12) ) ) |(transpose((((echo(arpeggio(X) ,4,6) +transpose(echo(step(X,12) ,4,6) ,7) ) |arpeggio(((X+transpose(shuffle(X) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ) +(((transpose((X|X) ,4) +transpose((transpose(X,4) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose((X|X) ,7) ) +transpose((((X+transpose(X,7) ) +X) +transpose(transpose(X,-7) ,7) ) ,4) ) ) ,-7) |transpose(transpose(X,4) ,-7) ) ) +transpose(step(transpose((arpeggio((arpeggio(transpose(echo(transpose(X,-7) ,4,6) ,-5) ) |transpose((transpose(X,4) |arpeggio(X) ) ,-7) ) ) |(((echo(arpeggio(echo(X,4,6) ) ,4,6) +transpose(step(transpose((X+X) ,4) ,12) ,12) ) +transpose((transpose(arpeggio(shuffle(X) ) ,4) +transpose(step(echo((X|X) ,4,6) ,12) ,12) ) ,7) ) +echo(transpose(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,-5) ) ,-7) ,4,6) ) ) ,-5) ,12) ,7) ) ) ,4) ,7) ) ,-5) ,7) ) ,-7) random seed used was 2532812
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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