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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((arpeggio(((((transpose(X,-5) +transpose((X|(X+transpose(X,7) ) ) ,12) ) |transpose((transpose(((X+transpose(step(X,12) ,7) ) |(X+transpose((X+transpose(X,12) ) ,12) ) ) ,-5) |shuffle(((X|X) +transpose((transpose(X,-5) +transpose(X,7) ) ,7) ) ) ) ,-7) ) +transpose(transpose((X|shuffle(transpose(X,-7) ) ) ,4) ,4) ) +transpose((shuffle(((X+transpose((X+X) ,12) ) +(((X+transpose((X|X) ,4) ) +transpose((X|X) ,7) ) +transpose(echo((X|X) ,4,6) ,12) ) ) ) +transpose((((X+transpose(X,12) ) +transpose(X,-5) ) +echo(X,4,6) ) ,7) ) ,7) ) ) |transpose(transpose(transpose((transpose((shuffle(X) |((((X|X) +X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,7) ) ) ,4) |((((transpose(X,4) +X) +transpose(transpose(shuffle(X) ,-7) ,7) ) +transpose(echo((((echo(X,4,6) +transpose((X|X) ,-5) ) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose((transpose(X,-5) |X) ,7) ) ,4,6) ,4) ) +transpose(transpose(transpose(((X+transpose(transpose(X,4) ,4) ) +transpose((X+X) ,7) ) ,-5) ,-5) ,7) ) ) ,4) ,-5) ,4) ) ,-5) +transpose(echo(transpose(arpeggio(transpose(shuffle((transpose(((X|X) +transpose(transpose(shuffle(X) ,4) ,12) ) ,-5) +transpose(echo(arpeggio(X) ,4,6) ,12) ) ) ,-7) ) ,4) ,4,6) ,12) ) +transpose(arpeggio((arpeggio(transpose(transpose((((((echo(X,4,6) +(((X|X) +transpose((X+X) ,12) ) +transpose(arpeggio(transpose(X,4) ) ,-5) ) ) +transpose(transpose(step(step(step(shuffle(X) ,12) ,12) ,12) ,-5) ,7) ) +transpose((echo(X,4,6) +transpose(shuffle(shuffle(transpose(transpose(X,-5) ,4) ) ) ,7) ) ,4) ) +transpose(echo((echo((X|X) ,4,6) |(arpeggio(X) +(X+transpose(X,7) ) ) ) ,4,6) ,7) ) +transpose(arpeggio(transpose((arpeggio(((X|X) +X) ) |transpose(X,-5) ) ,4) ) ,12) ) ,-7) ,-7) ) +(((transpose((((shuffle(transpose((X|X) ,-7) ) +transpose((transpose(((transpose(X,4) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,-7) +X) ,7) ) +((transpose(transpose(X,-7) ,-7) +transpose(((X+transpose(arpeggio(X) ,12) ) +(X+transpose(X,7) ) ) ,12) ) |transpose((X|(transpose(X,4) +transpose((X|X) ,7) ) ) ,-7) ) ) +echo((((X|transpose(transpose(X,-7) ,-7) ) |transpose(transpose(X,4) ,-5) ) +(echo((X|X) ,4,6) |step((X+X) ,12) ) ) ,4,6) ) ,-7) |transpose(transpose(step((((((X|X) +transpose(shuffle(X) ,12) ) +transpose(((X|X) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) +transpose(((X+X) +X) ,4) ) +transpose((echo(X,4,6) |X) ,7) ) ,12) ,-5) ,-5) ) |((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-7) ) ,-5) |transpose((transpose(transpose(X,4) ,-7) +transpose(((transpose(X,-7) +transpose((step(arpeggio(X) ,12) +transpose(X,-7) ) ,4) ) +transpose(transpose(transpose((X|X) ,-5) ,4) ,7) ) ,7) ) ,4) ) |(((transpose((arpeggio((X+transpose(X,12) ) ) +((((transpose(X,-7) +X) +X) +(X+X) ) |transpose(echo(arpeggio(X) ,4,6) ,-7) ) ) ,-7) +transpose(transpose((X+X) ,-5) ,12) ) +transpose((transpose((arpeggio(X) +transpose(X,-5) ) ,-5) +((((X+X) +transpose(echo(X,4,6) ,12) ) |(((transpose(shuffle(X) ,-5) +transpose((((step(X,12) +transpose(X,12) ) +transpose(shuffle((X|X) ) ,4) ) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,7) ) ,12) ) +transpose(transpose(X,-7) ,4) ) +transpose((X+(echo(X,4,6) +transpose((X+X) ,12) ) ) ,7) ) ) +(((transpose(echo(X,4,6) ,-7) |((X+X) |arpeggio(X) ) ) +arpeggio(((X+X) |(X+transpose(X,12) ) ) ) ) +transpose(((transpose(shuffle((X|arpeggio(X) ) ) ,-7) +transpose(((X+(X+transpose(X,12) ) ) |transpose((X+X) ,-7) ) ,4) ) +transpose((transpose(((X+transpose(X,12) ) +transpose(X,-5) ) ,-5) |step(transpose(X,-7) ,12) ) ,7) ) ,12) ) ) ) ,4) ) +transpose(shuffle((X|X) ) ,7) ) ) ) +transpose((((echo(transpose(step(X,12) ,-5) ,4,6) +transpose((((shuffle(step(shuffle(X) ,12) ) |(transpose(arpeggio(X) ,-5) +(echo(transpose(X,-5) ,4,6) +transpose(echo(transpose(transpose(X,-7) ,4) ,4,6) ,12) ) ) ) +((transpose(X,-5) |(transpose(X,4) |shuffle(transpose(X,4) ) ) ) |(transpose(X,4) +transpose(echo(X,4,6) ,12) ) ) ) +transpose(transpose(((echo((X+X) ,4,6) +transpose(transpose(transpose((X+X) ,4) ,4) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,-5) ,-5) ) ,7) ) +transpose((arpeggio(((((X+X) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) +transpose(echo(transpose((transpose(X,-5) +(X+X) ) ,-7) ,4,6) ,12) ) ) +transpose((((((X+transpose((X+transpose(X,12) ) ,-5) ) |transpose(transpose(X,-5) ,-5) ) |shuffle(transpose(X,4) ) ) +(echo(transpose((X+X) ,-5) ,4,6) +transpose(shuffle(transpose((X+X) ,-5) ) ,12) ) ) +transpose((((X+transpose(X,-7) ) +transpose(transpose(X,4) ,12) ) |step(transpose((X+X) ,-7) ,12) ) ,7) ) ,12) ) ,4) ) +transpose((((echo((X|transpose(X,-7) ) ,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(echo(transpose(transpose(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,-7) ,-5) ,4,6) ,12) ) +step(shuffle((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +shuffle(X) ) ) ,12) ) ,7) ) ,12) ) ) ) ,4) ) +transpose(((shuffle(((((((step(X,12) +transpose(X,12) ) +transpose(arpeggio((transpose((X+transpose(X,7) ) ,-7) +transpose(((X+transpose(X,7) ) +X) ,7) ) ) ,4) ) +transpose(((transpose(X,-7) +transpose((X|X) ,4) ) +transpose(((X|X) +(X+X) ) ,7) ) ,7) ) +(((arpeggio((X+transpose(X,12) ) ) +arpeggio(arpeggio(X) ) ) +transpose(((shuffle(X) +X) |transpose((X|X) ,-5) ) ,7) ) +(transpose(transpose(((transpose(X,-5) +transpose(X,4) ) |transpose((X+transpose(X,12) ) ,-5) ) ,4) ,-5) +((transpose(X,4) +transpose((((X|step(X,12) ) +transpose((transpose((X|X) ,-7) +transpose(transpose(X,-7) ,12) ) ,4) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) ,4) ) +transpose(((X+X) |echo((X+transpose(X,12) ) ,4,6) ) ,7) ) ) ) ) +transpose((transpose(arpeggio(transpose((X+transpose(shuffle(X) ,7) ) ,-5) ) ,4) +transpose(transpose(X,-7) ,-5) ) ,12) ) +transpose(transpose(echo(transpose(transpose((((transpose(transpose(X,-7) ,-5) +((transpose(X,4) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ) +transpose((X|(X|X) ) ,4) ) +transpose((((shuffle(X) +transpose(X,4) ) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,7) ) ,-5) ,-5) ,4,6) ,4) ,12) ) ) |(((echo(transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(transpose(step(arpeggio(X) ,12) ,-7) ,7) ) ,-7) ,4,6) +transpose((((step(echo(X,4,6) ,12) |(shuffle(X) +transpose(X,12) ) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ) |transpose(transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +X) |arpeggio(X) ) ,4) ,-5) ,4) ) |arpeggio(((transpose(transpose((((X+X) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-5) ,4) +transpose(step(arpeggio(X) ,12) ,12) ) +transpose(arpeggio(transpose(X,4) ) ,12) ) ) ) ) +transpose(transpose(transpose((transpose(((transpose(shuffle(X) ,4) +transpose((((X+X) +transpose(X,7) ) +transpose(echo((X+X) ,4,6) ,7) ) ,7) ) |(transpose(echo(X,4,6) ,-7) +X) ) ,-7) |arpeggio((transpose(transpose(arpeggio((transpose(X,4) |(X+transpose(transpose(X,-5) ,12) ) ) ) ,-7) ,4) +transpose(step((transpose(transpose((X|X) ,4) ,4) +(shuffle((X+transpose(X,12) ) ) +transpose(X,4) ) ) ,12) ,-7) ) ) ) ,4) ,-7) ,4) ) ,7) ) random seed used was 199528188
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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