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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(echo(echo(transpose((transpose(transpose(X,4) ,-5) |((echo(X,4,6) +transpose(transpose(step((X+transpose(X,12) ) ,12) ,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,4) ,4,6) ,4,6) ,-5) +transpose(arpeggio(arpeggio((transpose(step(transpose(transpose(echo(X,4,6) ,-5) ,-7) ,12) ,4) +transpose(step((((((X|X) |((transpose(X,-5) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) |((((X+transpose(X,12) ) |transpose(X,4) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) +transpose((transpose(transpose(X,4) ,-5) |transpose(shuffle(X) ,-5) ) ,4) ) +transpose(((arpeggio(echo(X,4,6) ) +transpose(X,7) ) +transpose(X,7) ) ,7) ) ,12) ,7) ) ) ) ,7) ) +step(echo(transpose(((echo(transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ,4,6) +transpose(step(((X+transpose(X,12) ) |transpose(X,-5) ) ,12) ,12) ) +transpose(transpose(((X|transpose(X,-5) ) +transpose(((X+transpose(X,12) ) +transpose(((X|X) |(X+transpose(X,7) ) ) ,7) ) ,7) ) ,-7) ,12) ) ,-7) ,4,6) ,12) ) ,-5) ,4) +transpose(transpose(((transpose(transpose(transpose(echo(transpose(step((transpose((X+transpose(X,7) ) ,-5) +transpose(((X|X) +transpose(X,12) ) ,7) ) ,12) ,-5) ,4,6) ,-5) ,4) ,4) |shuffle((transpose(transpose(transpose(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(X,4) ,7) ) ,4) ,-7) ,-7) ,-7) |step((arpeggio(arpeggio(transpose(transpose(X,4) ,-5) ) ) +transpose(transpose(((step(transpose(X,-7) ,12) +transpose(transpose(shuffle(X) ,-5) ,12) ) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) ,12) ) ,-7) ,12) ) ,12) ) ) ) |(((((arpeggio(step(X,12) ) |transpose(arpeggio((X+transpose(X,-7) ) ) ,-7) ) |shuffle((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) +transpose(X,12) ) ) ) +transpose(transpose(transpose(arpeggio(X) ,4) ,-7) ,-7) ) +transpose(echo(transpose(step(transpose((step(((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose((X|X) ,7) ) ,12) +transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ) ,-7) ,12) ,-7) ,4,6) ,12) ) |(transpose((((transpose(transpose(transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4) ,-7) ,4) +transpose(echo(arpeggio(arpeggio((transpose(X,-5) |step(X,12) ) ) ) ,4,6) ,12) ) |echo(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,4,6) ) |(echo(((shuffle(arpeggio(X) ) +transpose(transpose(X,4) ,12) ) |transpose(echo(X,4,6) ,4) ) ,4,6) +(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) |(transpose((X+transpose(X,12) ) ,4) +X) ) ) ) ,-5) +transpose((((transpose(arpeggio((X+transpose(X,7) ) ) ,4) |((transpose((X|transpose(X,-5) ) ,4) +transpose(transpose((((echo(echo(step(X,12) ,4,6) ,4,6) +(X+transpose(X,12) ) ) +transpose(transpose(shuffle((transpose(X,4) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) ) ,-7) ,4) ) +transpose(transpose(transpose((X|X) ,-7) ,4) ,7) ) ,-5) ,4) ) +transpose(arpeggio(transpose(((transpose(X,4) +transpose(X,12) ) +transpose(transpose(X,-7) ,12) ) ,-5) ) ,7) ) ) |(((((shuffle(((X|X) |((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose((X+X) ,4) ) +transpose((transpose(X,-5) |transpose(X,-5) ) ,7) ) ) ) +transpose(transpose(shuffle(transpose(X,-5) ) ,-7) ,4) ) +transpose((shuffle(((((X+transpose(X,7) ) |X) +transpose(X,7) ) +echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4,6) ) ) +transpose(((X|((transpose(X,-5) +transpose((X|X) ,4) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) |arpeggio(echo(X,4,6) ) ) ,-5) ) ,12) ) ,7) ) +transpose((transpose(echo(((shuffle(X) +transpose(X,4) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ,4,6) ,-7) |transpose((((transpose(X,-7) +transpose(transpose(echo(transpose(X,4) ,4,6) ,-7) ,4) ) +transpose(((transpose(X,4) +transpose((transpose(X,4) +(X+X) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose(((((X+X) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(X,7) ) ,12) ) ,-5) ) ,12) ) +transpose(((shuffle((((X|X) +transpose(X,4) ) +transpose(X,7) ) ) +((X+transpose(X,-7) ) +transpose(transpose(X,4) ,12) ) ) +transpose(((transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ,-7) +transpose((((step(X,12) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(X,7) ) +transpose((transpose(X,-7) +transpose(X,12) ) ,12) ) ,4) ) +transpose(((X|(X|X) ) |transpose((X|X) ,4) ) ,7) ) ,-5) ) ,4) ) +transpose(step(transpose(((arpeggio((transpose(transpose(X,-5) ,-7) |transpose(X,-5) ) ) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,-5) ,12) ,7) ) ) |arpeggio((transpose(((transpose(arpeggio(transpose(X,-7) ) ,4) +transpose(((transpose(X,-5) +transpose(((X+transpose(X,7) ) |X) ,4) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ,7) ) +transpose(transpose(transpose((X|X) ,4) ,-5) ,7) ) ,-7) +(((echo(((shuffle(X) +transpose(X,12) ) +transpose(arpeggio((X+X) ) ,7) ) ,4,6) +transpose(((X|X) |transpose(X,-7) ) ,4) ) +((X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,12) ) ,7) ) +transpose((step(X,12) |(X|X) ) ,12) ) ) +transpose((echo(transpose((transpose(transpose(X,-7) ,-5) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ,4,6) +transpose((((transpose((X|X) ,4) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) +transpose((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ,7) ) ,12) ) ) ) ) ,7) ) ) ) ,4) ,12) ) ,-5) random seed used was 227787911
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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