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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 16 generations the expression "X" became this: | ((((((((arpeggio((((transpose((X+X) ,4) |shuffle(transpose((arpeggio(X) +transpose((transpose(X,-5) +transpose(X,7) ) ,7) ) ,-7) ) ) +transpose(step(transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +(echo(X,4,6) +X) ) ,-5) ,12) ,4) ) +transpose(transpose(transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(((X|X) +transpose(X,12) ) ,7) ) |shuffle(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,-5) ,4) ,7) ) ) |transpose(transpose(((transpose(transpose((X|X) ,-7) ,-5) +echo(transpose(transpose(X,-5) ,-7) ,4,6) ) |transpose((echo(X,4,6) +transpose(transpose(X,4) ,7) ) ,-5) ) ,-5) ,-7) ) +transpose((((((shuffle((transpose(((transpose(echo(X,4,6) ,-5) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose(transpose(X,4) ,7) ) ,-7) +transpose(step(arpeggio(shuffle(step(X,12) ) ) ,12) ,12) ) ) +transpose((transpose((((X+transpose(X,7) ) +X) +(transpose(X,-5) +X) ) ,4) |(shuffle((X+X) ) +transpose(X,12) ) ) ,4) ) +transpose((((transpose((transpose(X,4) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) ,-5) |(echo((X+(X+transpose(X,7) ) ) ,4,6) +transpose((((X+transpose(X,12) ) +transpose((X+X) ,7) ) +transpose(step(transpose(X,-5) ,12) ,-7) ) ,12) ) ) +transpose(echo((transpose(step(X,12) ,4) +transpose((transpose(X,4) |(X|X) ) ,7) ) ,4,6) ,4) ) +transpose((((((X|X) +shuffle(X) ) +transpose(((X+transpose(X,-5) ) |(X|X) ) ,4) ) +transpose((X+X) ,7) ) +transpose((((transpose(X,-7) +arpeggio(X) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,7) ) ,7) ) +transpose(transpose(((transpose((X+transpose(X,7) ) ,4) +transpose(transpose(X,-7) ,12) ) +transpose(echo((transpose(transpose(shuffle(X) ,-5) ,-7) +transpose(transpose((X|X) ,-7) ,12) ) ,4,6) ,12) ) ,4) ,4) ) +transpose(transpose(transpose(transpose(transpose(((X|transpose(X,-7) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-7) ,-7) ,12) ) ,4) ,-5) ,4) ,4) ,7) ) |((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +(arpeggio(((X+transpose(X,12) ) |arpeggio(X) ) ) |(((transpose(X,4) +transpose((X|X) ,4) ) +transpose(transpose(X,-7) ,7) ) |(((transpose(X,-5) +transpose((X|X) ,12) ) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ) ) ) +echo((((echo((X+transpose(X,7) ) ,4,6) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +((X+X) +transpose((shuffle(echo(X,4,6) ) |(X|X) ) ,7) ) ) ,4,6) ) ) ,4) ) +transpose(transpose(transpose(transpose(((echo(((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) ,4,6) +transpose((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) +transpose((X+transpose((X+X) ,7) ) ,7) ) ,12) ) +transpose(transpose(X,4) ,-7) ) ,-7) ,4) ,4) ,7) ) +transpose(transpose(((transpose(transpose((echo(transpose(X,-5) ,4,6) +(echo(X,4,6) +transpose(X,12) ) ) ,-5) ,-7) +transpose(arpeggio(transpose((((transpose(X,4) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,4) ) ,4) ) +transpose(transpose((arpeggio(arpeggio((X+transpose(X,12) ) ) ) +transpose(transpose(((X+transpose((X+transpose(X,12) ) ,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,7) ) ,4) ,7) ) ,-7) ,4) ) +transpose((shuffle(transpose(((((X+transpose(X,7) ) +(X+transpose(X,7) ) ) |(transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,4) |transpose((echo(X,4,6) +X) ,4) ) ) +shuffle(arpeggio(step((X+X) ,12) ) ) ) ,-5) ) +transpose((((transpose(transpose((X+X) ,4) ,-5) +((transpose(X,-5) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(transpose(transpose((((X+transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,-7) ,-7) ,4) ) +transpose(transpose(((echo((X|(X+X) ) ,4,6) +transpose((echo((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) +transpose(X,4) ) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(X,7) ) |transpose(X,-5) ) ,7) ) ,4) ,7) ) ,12) ) ,7) ) +transpose((step(((echo(transpose(X,4) ,4,6) |transpose(((X+X) |((X|X) |X) ) ,4) ) +transpose((transpose(((((X+X) +transpose(arpeggio(X) ,4) ) +transpose(shuffle(X) ,7) ) +((X+transpose(X,-5) ) +echo((X+X) ,4,6) ) ) ,-7) |transpose((echo(step(X,12) ,4,6) +transpose(shuffle(X) ,12) ) ,-5) ) ,7) ) ,12) +transpose(transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) |step(shuffle(X) ,12) ) ,-7) ,4) ,7) ) ,-5) ) |echo((((shuffle(((transpose(X,-5) |transpose(transpose((X+transpose((X+X) ,12) ) ,-5) ,-7) ) +transpose(transpose(arpeggio((transpose(X,-5) +(X|X) ) ) ,4) ,4) ) ) +echo(((X+X) +X) ,4,6) ) +(echo(echo((shuffle(transpose(echo(X,4,6) ,4) ) +(((arpeggio(transpose(X,-7) ) +transpose(echo(X,4,6) ,7) ) +transpose(((echo(echo(X,4,6) ,4,6) +transpose(transpose(transpose(X,-5) ,-7) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,4,6) ,4,6) +(transpose(((transpose((X+transpose(X,7) ) ,4) +transpose(((X|X) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(X,7) ) ,-7) +(((echo(((transpose(X,4) +transpose((X|X) ,12) ) +((X|X) +transpose(shuffle(X) ,7) ) ) ,4,6) +transpose((transpose((echo((X+transpose(X,7) ) ,4,6) |transpose(transpose(X,-7) ,-7) ) ,-7) +(echo(shuffle(transpose(X,4) ) ,4,6) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ) ,4) ) +transpose(transpose((shuffle(echo(echo(X,4,6) ,4,6) ) +transpose(step(X,12) ,-5) ) ,4) ,7) ) |(((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) +transpose((transpose(X,-7) +(X|(X+transpose(X,12) ) ) ) ,7) ) +transpose(transpose((transpose(transpose(X,-7) ,4) |echo((X+transpose(X,7) ) ,4,6) ) ,4) ,4) ) +transpose(echo(echo(step((echo(shuffle((X+X) ) ,4,6) |(X|transpose(X,-7) ) ) ,12) ,4,6) ,4,6) ,7) ) ) ) ) ) +(((arpeggio(arpeggio((transpose((((X+X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-5) +transpose(transpose(transpose(X,4) ,-7) ,12) ) ) ) |((X+transpose(step(transpose(X,4) ,12) ,7) ) +transpose((shuffle(((X+X) +transpose((X+X) ,12) ) ) +echo(arpeggio(X) ,4,6) ) ,-5) ) ) +transpose(transpose((shuffle(((X|X) +transpose(echo(X,4,6) ,7) ) ) |shuffle(((X+transpose(X,7) ) |echo(X,4,6) ) ) ) ,-5) ,-5) ) +transpose(echo(echo(transpose(transpose((((X|X) |arpeggio(X) ) +(X|X) ) ,4) ,-5) ,4,6) ,4,6) ,12) ) ) ,4,6) ) +transpose(((transpose(arpeggio(transpose(echo((((transpose(X,-7) +transpose((X|X) ,4) ) +transpose((X+X) ,7) ) |(transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4,6) ,-5) ) ,-5) |arpeggio((transpose(step(X,12) ,4) |transpose(transpose(echo((shuffle(shuffle(X) ) +transpose((X+transpose(step(X,12) ,12) ) ,7) ) ,4,6) ,4) ,4) ) ) ) +echo((((echo(X,4,6) |shuffle(X) ) +transpose((((X+transpose(transpose((X|X) ,4) ,7) ) +transpose(transpose(((X+transpose(X,7) ) +transpose(shuffle((X|transpose((X+X) ,4) ) ) ,12) ) ,-7) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(transpose((transpose(X,-7) |(X|X) ) ,-7) ,4) ) ,7) ) ,4) ) +transpose(transpose(((transpose(X,-5) +transpose(X,-5) ) +transpose((X+transpose(X,7) ) ,12) ) ,-5) ,7) ) ,4,6) ) ,-7) ) random seed used was 171792583
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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