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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(arpeggio(transpose((transpose((arpeggio(transpose(((X|echo(X,4,6) ) +transpose(step(X,12) ,12) ) ,-5) ) |transpose(echo(arpeggio(transpose(X,4) ) ,4,6) ,-7) ) ,4) +transpose((transpose((echo((transpose(shuffle(transpose(X,-5) ) ,-5) +transpose(arpeggio(shuffle(X) ) ,7) ) ,4,6) |((step(transpose(echo(transpose(transpose(X,-5) ,4) ,4,6) ,4) ,12) +transpose((((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) |(transpose((X+X) ,-5) +transpose((X+transpose(shuffle(X) ,12) ) ,12) ) ) +transpose(transpose(X,-7) ,-5) ) +echo(echo((arpeggio((X|X) ) |(X+echo(X,4,6) ) ) ,4,6) ,4,6) ) ,7) ) +transpose(step((((transpose(arpeggio(echo((X|X) ,4,6) ) ,-7) +transpose(transpose(((X+X) +arpeggio(X) ) ,-7) ,4) ) +transpose(echo((X+transpose(X,-7) ) ,4,6) ,7) ) +transpose((transpose(arpeggio((X+transpose((X+transpose(X,12) ) ,12) ) ) ,-7) |transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose((echo(X,4,6) +transpose(transpose(X,-5) ,12) ) ,7) ) ,-7) ) ,12) ) ,12) ,12) ) ) ,-7) +transpose((echo((((X+transpose(X,12) ) +transpose(X,4) ) +((step(X,12) +transpose(X,12) ) |echo(X,4,6) ) ) ,4,6) +transpose(echo(((transpose((step(transpose(X,-7) ,12) |transpose(X,-5) ) ,-7) +transpose(transpose((arpeggio(transpose(X,-7) ) +((shuffle((X+transpose(X,12) ) ) +transpose(arpeggio(transpose((X|X) ,4) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,-7) ,4) ) +transpose(((step(X,12) +transpose(transpose((transpose(X,-7) +transpose(transpose((arpeggio(X) |X) ,4) ,12) ) ,-7) ,4) ) +transpose(arpeggio(((X+transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ) ,7) ) ,7) ) ,4,6) ,12) ) ,4) ) ,12) ) ,-5) ) ) +transpose(shuffle(transpose((transpose(echo((echo(X,4,6) +transpose((arpeggio(transpose(((X|X) |transpose(X,4) ) ,4) ) +(echo((X|X) ,4,6) +transpose(step(transpose(X,4) ,12) ,7) ) ) ,7) ) ,4,6) ,-5) +transpose((transpose(transpose(echo(transpose((transpose(X,4) +transpose(X,4) ) ,-5) ,4,6) ,-7) ,-5) |(echo(transpose(step(X,12) ,-7) ,4,6) +transpose(X,-7) ) ) ,12) ) ,4) ) ,4) ) +transpose(step((((((transpose((arpeggio(shuffle(X) ) +transpose(shuffle(transpose(transpose((((transpose(X,-5) +(X+transpose(X,12) ) ) +((X+X) +transpose(transpose(X,4) ,7) ) ) |arpeggio(X) ) ,-7) ,-5) ) ,7) ) ,4) +transpose(((((transpose(transpose((step((X+(X+transpose(X,12) ) ) ,12) +(X|(X+X) ) ) ,-5) ,4) +transpose(transpose(transpose((step(transpose(X,4) ,12) +transpose(transpose(X,-5) ,7) ) ,4) ,4) ,7) ) +echo(transpose(echo(shuffle(X) ,4,6) ,-7) ,4,6) ) +transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |echo(X,4,6) ) ,4) +(transpose(shuffle(X) ,4) +transpose(step(step(X,12) ,12) ,12) ) ) ,4) ) +transpose(arpeggio(shuffle(((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) +transpose(echo((step(X,12) |(X|X) ) ,4,6) ,4) ) ) ) ,7) ) ,7) ) +transpose((transpose(transpose(transpose(((X+transpose(X,7) ) +(X+transpose(X,12) ) ) ,4) ,4) ,4) |(shuffle((X+transpose(arpeggio(transpose((X+transpose(X,12) ) ,-5) ) ,7) ) ) +transpose(echo(transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,4,6) ,4) ) ) ,-5) ) |((step(transpose((echo(shuffle(step((transpose(X,4) +transpose((X+transpose(X,7) ) ,-7) ) ,12) ) ,4,6) |arpeggio(((shuffle(X) +transpose(X,-5) ) +transpose((transpose((X+X) ,-7) +transpose((echo(X,4,6) +(X+transpose(X,12) ) ) ,12) ) ,7) ) ) ) ,-7) ,12) +((step(shuffle(transpose(transpose(transpose(X,4) ,4) ,-7) ) ,12) |transpose(((X+transpose(X,12) ) +transpose(step(X,12) ,12) ) ,-5) ) |((((echo((transpose(transpose(X,4) ,4) +(X+arpeggio(X) ) ) ,4,6) +echo(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,4) ) +transpose(transpose(X,-5) ,4) ) +transpose(((X|X) +(X|X) ) ,7) ) ,4) ,4,6) ) +transpose(echo(((X+X) +transpose(X,-7) ) ,4,6) ,7) ) +transpose((((((((((transpose(X,-5) +transpose(transpose((X|X) ,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(echo(echo(echo(X,4,6) ,4,6) ,4,6) ,12) ) +transpose((X|step(X,12) ) ,4) ) +transpose(((transpose((X|X) ,-5) +transpose(transpose(X,-7) ,12) ) |step((X+X) ,12) ) ,7) ) +transpose((X+shuffle((X+transpose(step((X|X) ,12) ,12) ) ) ) ,12) ) +transpose(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,-7) ,-7) ,4) ) +transpose(transpose((arpeggio(((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(shuffle(X) ,7) ) ) +transpose(transpose(transpose(X,4) ,-7) ,12) ) ,-5) ,7) ) |transpose(((X+(transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose(((((X+transpose(X,7) ) |(transpose(X,-5) +(X|X) ) ) +transpose((echo((X+transpose(X,12) ) ,4,6) |(X|X) ) ,4) ) +transpose(transpose(step(arpeggio(X) ,12) ,-5) ,7) ) ,12) ) ,-5) ) ,4) ) +transpose(transpose((arpeggio(((transpose(((X+X) +step(transpose(X,-5) ,12) ) ,-7) +transpose(((X|X) |(X+X) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) +((transpose(X,-7) |(arpeggio(X) +(X|X) ) ) |(transpose(step((transpose(X,-5) +X) ,12) ,-5) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ) ) ,4) ,7) ) ) ) +transpose(transpose(transpose(step(transpose(transpose(transpose(X,4) ,-5) ,4) ,12) ,-5) ,-7) ,7) ) ) +transpose(shuffle(shuffle(transpose(((transpose((shuffle(transpose(X,-5) ) +step(X,12) ) ,-5) +(X+transpose(X,12) ) ) +transpose((((((((X+transpose(echo(X,4,6) ,12) ) |(X+(X+transpose(X,7) ) ) ) +transpose(transpose(shuffle(transpose(X,-5) ) ,-7) ,4) ) +transpose((X|(X+X) ) ,7) ) |(((X|X) |X) +(X|shuffle(X) ) ) ) +transpose(transpose(arpeggio((X+transpose((((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose((step(X,12) +transpose(step(X,12) ,7) ) ,7) ) ,7) ) ) ,4) ,4) ) +transpose((step(transpose(X,-7) ,12) +transpose(transpose(echo(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((X|X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) ,4) ,12) ) ,7) ) ,12) ) ,4) ) ) ,-7) ) |transpose(transpose(((transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(step(transpose(X,-7) ,12) ,12) ) ,-5) |transpose(step(((X|X) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,12) ,-7) ) |shuffle(((shuffle(transpose(X,4) ) +transpose(((X+transpose(X,7) ) +transpose((X|X) ,12) ) ,12) ) +transpose((((X+transpose(X,-5) ) +transpose(X,7) ) +transpose((transpose(X,4) +transpose(arpeggio(X) ,12) ) ,7) ) ,4) ) ) ) ,4) ,-7) ) ,12) ,7) ) ,4) random seed used was 222534881
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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