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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(step(transpose(transpose((X+(X|X) ) ,-5) ,-7) ,12) ,-7) ,4) |transpose(transpose((((transpose(((((((X+transpose(X,7) ) +transpose((transpose(X,-5) +shuffle(X) ) ,7) ) +transpose(transpose(transpose(transpose(X,4) ,4) ,-5) ,12) ) +transpose((transpose(((X+X) +transpose(X,-5) ) ,-5) |arpeggio(transpose(X,4) ) ) ,4) ) +transpose((((X+transpose((X|X) ,7) ) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose(transpose((((((transpose(X,4) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) +transpose(X,7) ) +transpose(transpose((X|X) ,-5) ,4) ) +transpose(transpose((arpeggio(X) +transpose(X,12) ) ,4) ,7) ) ,4) ,12) ) ,-5) +transpose((echo((X+shuffle(X) ) ,4,6) |arpeggio((X|X) ) ) ,4) ) +transpose(((transpose(((X|echo(X,4,6) ) |X) ,-5) +transpose((transpose((transpose(X,-5) +(X+transpose(X,7) ) ) ,4) |((X+X) +transpose((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) |transpose(X,4) ) ,7) ) ) ,4) ) +transpose(transpose((transpose((transpose(X,-5) +transpose(transpose(X,-5) ,12) ) ,-5) +transpose((transpose(X,-7) +transpose((transpose(X,4) +transpose((X|X) ,7) ) ,12) ) ,7) ) ,-7) ,7) ) ,7) ) +echo(transpose(((transpose(arpeggio(X) ,4) +transpose((((echo(X,4,6) +transpose(((transpose(X,-5) +transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) ,12) ) +transpose(((X|X) +transpose((X+X) ,12) ) ,4) ) +transpose((X+X) ,7) ) ,7) ) |transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) ,-5) ,4,6) ) ,-5) ,-5) ) +((((transpose(((shuffle(transpose((((X+transpose((X+X) ,7) ) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(transpose(X,4) ,7) ) ,-7) ) +(((X+transpose((X+transpose(X,7) ) ,-5) ) +transpose((X+transpose(arpeggio(X) ,7) ) ,4) ) +transpose((transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X|X) ,7) ) ,-5) +(X|step(X,12) ) ) ,7) ) ) +transpose(shuffle(transpose(echo(arpeggio(X) ,4,6) ,4) ) ,7) ) ,-5) +transpose((echo(step(transpose(transpose(X,4) ,-7) ,12) ,4,6) +((((transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) +transpose(transpose((X|X) ,-5) ,-7) ) +transpose((X+(step(X,12) +transpose(X,-5) ) ) ,7) ) |(shuffle((step((echo(X,4,6) |arpeggio(X) ) ,12) +arpeggio(transpose(X,4) ) ) ) +transpose(((((arpeggio(X) +transpose(transpose(shuffle(X) ,4) ,7) ) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) +((((transpose(X,-5) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) |echo(X,4,6) ) +(transpose(X,4) +transpose(transpose((X+transpose(X,7) ) ,-7) ,12) ) ) ) +(echo((((X+(X+X) ) +X) |shuffle(step(X,12) ) ) ,4,6) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,4) ) ) ,4) ) ) +transpose(((transpose((arpeggio((X+transpose(X,7) ) ) +transpose(transpose(transpose(arpeggio(X) ,-5) ,-5) ,12) ) ,-7) |shuffle((((echo(X,4,6) |(X+transpose(transpose(X,4) ,4) ) ) +transpose(((X+((X+transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) ) |transpose(transpose(echo(X,4,6) ,-5) ,-5) ) ,4) ) +transpose(arpeggio(((step(X,12) +echo(X,4,6) ) +transpose(arpeggio(shuffle((X|X) ) ) ,12) ) ) ,7) ) ) ) +step(transpose(transpose(X,4) ,4) ,12) ) ,7) ) ) ,4) ) +transpose(transpose((((transpose(transpose(X,-5) ,-5) +transpose(transpose(X,-5) ,12) ) +(((((transpose(X,4) +transpose((X+transpose(step(X,12) ,12) ) ,12) ) |(X+X) ) |((((echo(X,4,6) +transpose(X,7) ) +transpose(X,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) ,7) ) +transpose(transpose(X,-5) ,-5) ) ) +transpose(arpeggio(transpose(echo(transpose(X,4) ,4,6) ,-5) ) ,7) ) |transpose(transpose(arpeggio(arpeggio(X) ) ,-5) ,4) ) ) +transpose(((echo(step((X+transpose(X,7) ) ,12) ,4,6) +(transpose((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-7) +transpose(transpose(X,-7) ,7) ) ) +transpose((transpose((echo(X,4,6) +X) ,-7) |((X+transpose(X,12) ) +(X+X) ) ) ,12) ) ,12) ) ,4) ,7) ) +transpose((((transpose((((shuffle(X) +transpose((echo(step(X,12) ,4,6) +(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +(arpeggio(X) +transpose(transpose(X,4) ,7) ) ) +(X+transpose((X|X) ,12) ) ) ) ,4) ) +transpose((((X+transpose(X,7) ) +transpose(X,7) ) |transpose((arpeggio(X) |transpose(X,-7) ) ,-7) ) ,7) ) +transpose((((((((X+transpose(X,12) ) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(transpose(transpose(X,-5) ,-5) ,4) ) +transpose(transpose((X|(X+transpose((X+transpose(X,7) ) ,12) ) ) ,-7) ,7) ) +((X+transpose(transpose(transpose(X,-5) ,-7) ,7) ) +transpose(shuffle(transpose(X,-7) ) ,4) ) ) +transpose((transpose(transpose(shuffle(X) ,4) ,4) +(transpose((X+transpose(X,12) ) ,-7) +transpose((X+transpose((X+X) ,7) ) ,7) ) ) ,4) ) +transpose(transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-5) ,4) ,7) ) ,12) ) ,-7) +transpose(echo(transpose(transpose((((transpose(X,4) +transpose((X|X) ,7) ) |(step(X,12) |shuffle((X|X) ) ) ) +transpose((shuffle(X) |echo(arpeggio(X) ,4,6) ) ,12) ) ,-5) ,-5) ,4,6) ,4) ) +transpose(arpeggio((((((shuffle((X|(X+transpose(X,7) ) ) ) +step((X+X) ,12) ) +transpose((transpose(shuffle((X|X) ) ,-5) |transpose((transpose(X,-5) +transpose(X,7) ) ,-5) ) ,12) ) +transpose((transpose(echo(transpose(X,-7) ,4,6) ,-5) |(X+transpose(X,-5) ) ) ,4) ) +transpose(step((transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) ,-7) +(transpose((X+X) ,4) +echo((X+X) ,4,6) ) ) ,12) ,7) ) +(((((step(X,12) +transpose(step(X,12) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) |transpose(X,4) ) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +(transpose((X|X) ,4) +(step((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) |((X|X) +transpose(arpeggio(X) ,12) ) ) ,12) +transpose(shuffle(transpose(X,-5) ) ,7) ) ) ) ) ) ,7) ) +((arpeggio((step(X,12) +transpose((transpose((((X|X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,-5) +transpose(transpose(transpose(X,4) ,-5) ,12) ) ,12) ) ) |transpose(shuffle(step((step(X,12) |step(echo(echo(transpose(X,-5) ,4,6) ,4,6) ,12) ) ,12) ) ,-5) ) |arpeggio(transpose(echo(((((((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +shuffle(X) ) |((X|X) |transpose(X,4) ) ) |((transpose(X,4) +transpose((X+X) ,7) ) |step(arpeggio(transpose(transpose(X,4) ,-5) ) ,12) ) ) +transpose(transpose((step(transpose(X,-5) ,12) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ,4) ,4) ) +transpose(transpose(transpose(((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,4) ,7) ) ,4,6) ,-7) ) ) ) ,7) ) +step(transpose((transpose(echo(transpose(transpose(transpose((echo(step(X,12) ,4,6) +(X+X) ) ,-5) ,-5) ,-7) ,4,6) ,-7) +arpeggio(transpose(transpose(transpose(X,4) ,-5) ,-7) ) ) ,-5) ,12) ) ) ,-7) random seed used was 162055013
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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