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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 18 generations the expression "X" became this: | ((transpose((((transpose(((transpose(((transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-5) +transpose(shuffle(shuffle((X|X) ) ) ,12) ) +((X|X) +transpose(X,-5) ) ) ,-5) +transpose((echo((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) |(transpose(X,4) +transpose(shuffle(X) ,7) ) ) ,12) ) |(transpose((transpose(transpose((X+X) ,-7) ,-7) +transpose(shuffle(transpose(X,-5) ) ,12) ) ,4) +transpose((step(shuffle((X+X) ) ,12) |(transpose((transpose(X,-7) +transpose(transpose(step(X,12) ,-5) ,12) ) ,4) +transpose(((X+transpose(X,7) ) |X) ,-7) ) ) ,12) ) ) ,-7) |(shuffle((shuffle(shuffle(echo(echo((arpeggio(transpose(transpose(X,-5) ,4) ) +transpose(echo(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,4,6) ,4,6) ) ) +transpose((arpeggio(arpeggio(((shuffle(X) |arpeggio(X) ) +transpose((X+transpose(X,12) ) ,12) ) ) ) +echo(transpose(transpose(transpose((echo(transpose(X,4) ,4,6) +echo(X,4,6) ) ,-7) ,-7) ,-5) ,4,6) ) ,7) ) ) +transpose((((step(step(((echo(step(step(X,12) ,12) ,4,6) |(transpose(echo(X,4,6) ,-7) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ) +((transpose(arpeggio(X) ,4) |((X+X) +transpose(X,7) ) ) +((X+transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ) ) ,12) ,12) +transpose(((((((((X|X) +transpose(echo(X,4,6) ,12) ) |(transpose(X,-5) +echo((X+transpose(X,12) ) ,4,6) ) ) +transpose((transpose(transpose(X,-7) ,-7) |((X+transpose(X,7) ) +(X+transpose(X,7) ) ) ) ,4) ) +transpose(echo((transpose((X+transpose(X,7) ) ,-5) +step(transpose(X,-5) ,12) ) ,4,6) ,7) ) +transpose(transpose((transpose(transpose(arpeggio(X) ,-5) ,-7) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) +transpose(transpose(transpose(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) ,-5) ,-7) ,-5) ,4) ,12) ) ,12) ) +transpose(((arpeggio((transpose((X+X) ,4) +(arpeggio(transpose(X,-5) ) +echo((X+transpose(X,7) ) ,4,6) ) ) ) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(transpose(transpose((transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) +transpose((X+X) ,-5) ) ,4) ,-7) ,12) ) ,4) ) +transpose(((((X|transpose(X,-7) ) |X) +step((echo(transpose(X,4) ,4,6) |echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,12) ) |(transpose((arpeggio((X|X) ) +echo((((shuffle(X) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +step((X+transpose(X,7) ) ,12) ) ,4,6) ) ,-5) |((X|(X|X) ) +transpose((transpose(X,-5) +transpose((X+X) ,7) ) ,12) ) ) ) ,7) ) ,12) ) ) |arpeggio(transpose((transpose(transpose(shuffle((X+transpose(((X+X) +transpose(X,7) ) ,7) ) ) ,4) ,4) +transpose(arpeggio(transpose(transpose(transpose(transpose(X,-5) ,-7) ,4) ,-5) ) ,12) ) ,-7) ) ) +transpose(echo((transpose((((transpose(step(X,12) ,-7) +X) +transpose(transpose(X,-5) ,7) ) |((transpose(transpose(X,-7) ,4) +transpose((transpose(X,4) +transpose(arpeggio(arpeggio(X) ) ,7) ) ,4) ) +transpose((transpose((transpose(X,4) +(X+transpose(X,7) ) ) ,4) |(X|shuffle(X) ) ) ,7) ) ) ,-5) +transpose(transpose((arpeggio(((shuffle(X) |echo((X+transpose(X,7) ) ,4,6) ) |(echo(X,4,6) |(step(X,12) +(transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ) ) +transpose(transpose(((step((transpose(X,-5) |(transpose(X,4) +transpose(X,7) ) ) ,12) +(echo(transpose((X+transpose(X,7) ) ,4) ,4,6) +transpose(step(X,12) ,-5) ) ) +(shuffle(shuffle(((transpose(X,4) +transpose((X+X) ,4) ) +transpose(X,7) ) ) ) |transpose(shuffle((transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) ) ,-7) ) ) ,4) ,12) ) ,4) ,7) ) ,4,6) ,12) ) ,4) +transpose(transpose(transpose(echo(transpose((transpose(shuffle(step(transpose(transpose((X+transpose(X,7) ) ,4) ,-7) ,12) ) ,-7) +transpose(arpeggio(transpose((X+X) ,-7) ) ,7) ) ,4) ,4,6) ,4) ,-5) ,4) ) +transpose((((step(transpose(((transpose(transpose(transpose((X|X) ,-7) ,-5) ,-7) |(((transpose(echo(X,4,6) ,4) +transpose(arpeggio(transpose(step(X,12) ,4) ) ,4) ) +transpose((X+transpose(arpeggio(transpose((X+transpose(X,7) ) ,4) ) ,12) ) ,7) ) +(transpose((X+X) ,-5) +(arpeggio(step(step(X,12) ,12) ) |step(transpose(X,-5) ,12) ) ) ) ) +transpose((((transpose(step((transpose(X,-7) |X) ,12) ,-7) +transpose((transpose(transpose(transpose(X,-7) ,-7) ,-7) |((X+X) +transpose((X+transpose(X,12) ) ,12) ) ) ,12) ) +transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) |((X+X) +transpose(transpose(X,-7) ,12) ) ) ,12) ) +transpose(shuffle((X+transpose(X,12) ) ) ,12) ) ,12) ) ,4) ,12) +transpose(((arpeggio(arpeggio(transpose(arpeggio(X) ,-5) ) ) |((step(((transpose(((X+X) +transpose(X,-5) ) ,-5) +transpose(transpose(transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose((X|X) ,7) ) ,-5) ,4) ,12) ) +transpose(transpose((transpose(X,-5) +(echo(X,4,6) |(X+transpose(X,7) ) ) ) ,4) ,7) ) ,12) +transpose(arpeggio(transpose(step(step(echo(transpose(X,4) ,4,6) ,12) ,12) ,-5) ) ,4) ) +transpose(transpose((transpose((transpose(transpose(X,4) ,-5) |(((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ,-5) |transpose((transpose((X|(X|X) ) ,-7) +(shuffle(X) +transpose((transpose(X,4) +X) ,7) ) ) ,4) ) ,4) ,7) ) ) |(((transpose(((X+transpose(X,12) ) +((X+transpose(X,7) ) +transpose(step(X,12) ,12) ) ) ,4) |(((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((((X|X) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) +(X|step(X,12) ) ) ,12) ) ) +transpose(step((transpose((transpose(X,-5) +transpose((X+X) ,12) ) ,4) +transpose(arpeggio(transpose(X,-5) ) ,12) ) ,12) ,7) ) +echo(transpose(echo(X,4,6) ,-7) ,4,6) ) ) ,7) ) |step(transpose(echo((transpose(((((transpose((X+X) ,-7) +transpose(transpose((((((X|X) +transpose(transpose(X,-7) ,4) ) +transpose((X|X) ,7) ) +transpose((X+transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) +transpose(X,4) ) +transpose(transpose(step(transpose(echo(X,4,6) ,-7) ,12) ,4) ,7) ) ,-5) +transpose(((transpose(transpose((X|X) ,4) ,4) +transpose(transpose((X+X) ,-7) ,-7) ) +transpose(transpose(arpeggio(transpose(X,4) ) ,-7) ,12) ) ,12) ) ,4,6) ,-7) ,12) ) |shuffle(transpose(shuffle(((((((step(X,12) |(X|transpose(X,4) ) ) +transpose(transpose(transpose((arpeggio(X) +transpose(X,12) ) ,-7) ,-5) ,7) ) +transpose(transpose(((((((X|X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) |(((X|(X+transpose(X,12) ) ) |transpose(X,-7) ) |shuffle((X|X) ) ) ) ,4) ,4) ) +transpose((transpose(transpose(((X|X) +transpose(transpose(X,-7) ,12) ) ,-5) ,4) |(echo((((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) +(X+transpose(X,7) ) ) ,4,6) +transpose(transpose(X,-7) ,4) ) ) ,7) ) +transpose(transpose(step(echo(transpose(transpose(X,-7) ,4) ,4,6) ,12) ,-5) ,12) ) +transpose(shuffle((arpeggio((X+(X+transpose(X,12) ) ) ) +transpose((transpose(transpose((X|X) ,4) ,-5) +step(arpeggio((X|X) ) ,12) ) ,7) ) ) ,7) ) ) ,-7) ) ) ,7) ) random seed used was 189355312
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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