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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(arpeggio(transpose(step((X+transpose(X,12) ) ,12) ,-7) ) ,4) +((shuffle(transpose(transpose((X+X) ,4) ,4) ) +transpose(((shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,12) ) ) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,7) ) ,4) ) +transpose(((transpose((transpose(X,-5) +X) ,-5) +transpose(transpose(shuffle((X+transpose(X,4) ) ) ,-5) ,12) ) +transpose(shuffle(echo(arpeggio(X) ,4,6) ) ,12) ) ,7) ) ) ,-5) ,4) |transpose(arpeggio((((transpose(((arpeggio(X) +transpose((X|X) ,12) ) +(((X+transpose(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) ) ,4) +transpose(X,4) ) +transpose(shuffle((step(transpose(arpeggio(X) ,-7) ,12) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ,12) ) ) ,7) ) |(transpose(transpose(X,-5) ,-7) |step(transpose(X,-5) ,12) ) ) ) ,-7) ) |((((transpose(transpose(step(transpose((((X+transpose((X|X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((X|X) ,-7) ) ,-7) ,12) ,4) ,4) +transpose((((transpose((transpose(X,4) +transpose(X,4) ) ,-7) +transpose(arpeggio((echo(step(X,12) ,4,6) +(transpose((X+X) ,4) |X) ) ) ,4) ) +transpose(shuffle(((((transpose(((X+(X+transpose(X,12) ) ) +transpose((X+transpose(X,12) ) ,12) ) ,-5) +transpose(((transpose(X,4) |((X+transpose(X,12) ) |X) ) |step(transpose(X,-5) ,12) ) ,4) ) +transpose((((transpose(X,-5) +transpose(((X|X) +X) ,12) ) +transpose((echo(step((X+transpose(X,7) ) ,12) ,4,6) |((X+X) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ) ,4) ) +transpose(shuffle((transpose(echo(X,4,6) ,-7) +transpose((X+transpose(X,12) ) ,7) ) ) ,7) ) ,7) ) +transpose(step((X+transpose(X,12) ) ,12) ,4) ) +transpose(transpose(((X|X) +transpose(echo(echo(step(X,12) ,4,6) ,4,6) ,7) ) ,4) ,7) ) ) ,4) ) +transpose(transpose(shuffle((((transpose(transpose(X,4) ,-7) +transpose(echo((transpose(X,-5) +transpose(X,7) ) ,4,6) ,7) ) +(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) +echo(transpose(X,-7) ,4,6) ) ) |((echo(transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ,4,6) |(((transpose(transpose(X,-7) ,-7) +transpose(transpose(X,-7) ,7) ) +transpose(((X+transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose((transpose(transpose(X,-5) ,4) +echo(X,4,6) ) ,7) ) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) +transpose((X+transpose(transpose(X,4) ,7) ) ,12) ) +transpose(((X+transpose(arpeggio(X) ,7) ) +echo((arpeggio(X) +transpose((X+transpose(X,7) ) ,12) ) ,4,6) ) ,12) ) ,7) ) ) ) ,-7) ,7) ) ,12) ) +transpose((transpose((((((transpose(X,4) +(((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) ) +transpose(transpose(arpeggio((X+X) ) ,-5) ,4) ) +transpose(echo(arpeggio((X+transpose(X,12) ) ) ,4,6) ,7) ) |transpose(transpose(X,4) ,4) ) +transpose((transpose(((echo(transpose((X+X) ,-5) ,4,6) +transpose(transpose((X+X) ,4) ,4) ) +transpose((X+transpose(echo(X,4,6) ,7) ) ,7) ) ,-5) +transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,-7) ) ,7) ) ,4) +transpose(((transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose((X+transpose(X,12) ) ,-7) ) ,4) +(echo(transpose((X|(X+X) ) ,4) ,4,6) +transpose(transpose(X,-5) ,7) ) ) +transpose((transpose((((arpeggio(X) +(shuffle(X) +transpose(X,-5) ) ) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) +transpose((transpose(X,-7) +(X+transpose((X+X) ,-5) ) ) ,12) ) ,4) +transpose(((X+transpose(X,12) ) +transpose(X,4) ) ,4) ) ,12) ) ,12) ) ,12) ) |((transpose(transpose((echo(X,4,6) |(X|X) ) ,-7) ,4) |echo(transpose((transpose(X,-5) +transpose(step(transpose(transpose(X,4) ,-5) ,12) ,7) ) ,-7) ,4,6) ) +transpose((echo((transpose(X,4) +X) ,4,6) +transpose(echo((X+(X|X) ) ,4,6) ,7) ) ,-5) ) ) +transpose((((((echo(X,4,6) |X) +transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ,12) ) |transpose(((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose((transpose(X,4) +X) ,7) ) +(X+X) ) ,4) ) |(echo((transpose(transpose(transpose(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-7) ,-7) ,-5) ,-7) +(((shuffle(step(((X+X) |X) ,12) ) +echo(transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,-5) ,4,6) ) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) |arpeggio(transpose((transpose((X+transpose(X,7) ) ,4) |((echo(transpose(X,-5) ,4,6) +transpose(transpose(arpeggio(X) ,4) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ) ,-5) ) ) ) ,4,6) |(((echo(echo(arpeggio(transpose(echo(X,4,6) ,-5) ) ,4,6) ,4,6) +transpose((((transpose(step(((((((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose(step(X,12) ,-7) ,4) ) +transpose((X|X) ,7) ) +transpose((step(X,12) +transpose(X,4) ) ,12) ) |transpose(((X+X) +transpose(X,12) ) ,-7) ) ,12) ,-7) +transpose((transpose(step((transpose(arpeggio(X) ,4) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,12) ) ,12) ,4) +((shuffle((X+X) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +(transpose(transpose((X+transpose(transpose(X,-5) ,12) ) ,4) ,4) |echo((arpeggio(X) +transpose((X+X) ,12) ) ,4,6) ) ) ) ,12) ) +transpose(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,-5) ,-7) ,4) ) +transpose((((transpose(step(transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) ,12) ,4) +transpose(transpose(shuffle(transpose(echo(X,4,6) ,4) ) ,-5) ,4) ) +transpose((transpose(echo((transpose(X,-5) |X) ,4,6) ,4) |transpose(transpose(X,-5) ,-5) ) ,7) ) +step(step((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +(transpose((X+transpose(X,7) ) ,4) +transpose(transpose(X,-5) ,12) ) ) ,12) ,12) ) ,7) ) ,4) ) +transpose(arpeggio(transpose((X|X) ,-7) ) ,7) ) +transpose(transpose(step(((arpeggio(X) +transpose(((X+transpose(X,12) ) |shuffle(X) ) ,7) ) |(transpose((((X+X) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) ,-5) +transpose(transpose(transpose(transpose((X|X) ,-5) ,4) ,4) ,7) ) ) ,12) ,-5) ,7) ) ) ) |arpeggio(transpose(shuffle((arpeggio(transpose(((transpose((X+X) ,4) +transpose((transpose(transpose((X|X) ,-5) ,4) +((X+X) |(X+transpose(X,7) ) ) ) ,4) ) +transpose((transpose(X,4) |(transpose(X,4) +X) ) ,7) ) ,4) ) +transpose((transpose(transpose((((X+transpose(X,7) ) |transpose(X,-5) ) |transpose(X,4) ) ,-7) ,-7) +transpose(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(((transpose((X|X) ,4) +transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose((transpose(X,-7) +transpose(X,12) ) ,7) ) ,7) ) ,4) ,7) ) ,12) ) ) ,-7) ) ) ,12) ) ) random seed used was 139871063
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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