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