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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(((step(echo((shuffle((echo(shuffle(transpose(step(X,12) ,4) ) ,4,6) +arpeggio(transpose(((transpose(X,4) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) ) ) |transpose(echo((transpose(arpeggio(((step(step(echo(X,4,6) ,12) ,12) +transpose(step((X+transpose(X,12) ) ,12) ,4) ) +transpose(((transpose(X,-7) +transpose(step(transpose(X,-5) ,12) ,4) ) +transpose(arpeggio((X+X) ) ,7) ) ,7) ) ) ,-7) +transpose(transpose(((((shuffle(X) +transpose(echo(step(X,12) ,4,6) ,12) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,12) ) +transpose((arpeggio(transpose((X+transpose(X,12) ) ,4) ) |transpose(step(((X|X) +X) ,12) ,4) ) ,4) ) +transpose(transpose(transpose(arpeggio(X) ,-5) ,4) ,7) ) ,-7) ,7) ) ,4,6) ,-5) ) ,4,6) ,12) +transpose(((transpose(echo((step(((X|step(X,12) ) +transpose(shuffle(echo(X,4,6) ) ,12) ) ,12) +shuffle(transpose(transpose(X,-5) ,-5) ) ) ,4,6) ,4) |transpose(shuffle(step((arpeggio((step(echo(transpose(X,-5) ,4,6) ,12) |echo((transpose(transpose(X,4) ,-5) +arpeggio(X) ) ,4,6) ) ) +(shuffle(arpeggio(shuffle(arpeggio(step((X+transpose(X,7) ) ,12) ) ) ) ) |shuffle(arpeggio(transpose(shuffle(X) ,-5) ) ) ) ) ,12) ) ,4) ) +transpose(arpeggio(shuffle(transpose((transpose((X+X) ,4) +transpose((((transpose((((X+transpose(X,12) ) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,4) +transpose(transpose(transpose((X+X) ,-7) ,4) ,7) ) +transpose(step(step(step((shuffle(X) +transpose(transpose(X,4) ,12) ) ,12) ,12) ,12) ,7) ) +transpose(step(shuffle(transpose(transpose(step(X,12) ,-7) ,4) ) ,12) ,12) ) ,4) ) ,4) ) ) ,7) ) ,4) ) +transpose(transpose((shuffle(transpose(arpeggio((step(transpose(arpeggio(X) ,4) ,12) +echo(step(X,12) ,4,6) ) ) ,-5) ) |transpose(transpose(shuffle(shuffle(arpeggio(shuffle((X+transpose(X,7) ) ) ) ) ) ,4) ,-5) ) ,4) ,7) ) ,-7) random seed used was 211
EXPR = ((arpeggio(arpeggio((shuffle(step(transpose(transpose(arpeggio(X) ,4) ,-5) ,12) ) |(shuffle(arpeggio(shuffle(step(X,12) ) ) ) +step(step(arpeggio(transpose((X+transpose(X,12) ) ,4) ) ,12) ,12) ) ) ) ) +(shuffle(((echo(((shuffle(step(transpose(arpeggio((shuffle(X) +transpose((echo(X,4,6) +X) ,12) ) ) ,4) ,12) ) +transpose(shuffle((X+echo(shuffle(X) ,4,6) ) ) ,4) ) +transpose(transpose(shuffle(arpeggio(((X+transpose(X,7) ) |step((X|X) ,12) ) ) ) ,4) ,7) ) ,4,6) +transpose(transpose((((transpose(X,-5) +transpose((((((arpeggio(X) |(arpeggio(X) +transpose(transpose(X,4) ,12) ) ) +arpeggio(transpose(X,4) ) ) |step(step(transpose(X,-5) ,12) ,12) ) +transpose((echo(((X+X) +shuffle(X) ) ,4,6) +transpose((transpose(step(shuffle(X) ,12) ,-5) +step(X,12) ) ,7) ) ,4) ) +transpose(step((shuffle(X) +transpose(arpeggio((X+transpose(X,7) ) ) ,12) ) ,12) ,7) ) ,7) ) +step((((X+transpose(X,12) ) +transpose(step(X,12) ,-5) ) +echo(arpeggio(arpeggio(X) ) ,4,6) ) ,12) ) |step(transpose(transpose(X,-7) ,-5) ,12) ) ,-5) ,4) ) +transpose(arpeggio((((arpeggio(transpose(transpose(transpose(arpeggio(X) ,-5) ,-5) ,-7) ) +transpose(transpose((step(((shuffle(X) +transpose(X,4) ) +transpose(X,7) ) ,12) +transpose((transpose((X+transpose(X,12) ) ,4) +transpose(X,4) ) ,7) ) ,-5) ,12) ) +transpose(transpose((arpeggio(X) +(((X+shuffle(X) ) +((X+transpose(X,12) ) |transpose(X,-5) ) ) |(X+transpose(X,7) ) ) ) ,-7) ,7) ) +transpose(((shuffle((step(step(transpose((X+transpose(X,7) ) ,-5) ,12) ,12) |echo((X+arpeggio(X) ) ,4,6) ) ) +transpose(transpose((arpeggio(shuffle(transpose(X,4) ) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,-5) ,4) ) +transpose(transpose(arpeggio(((arpeggio(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +shuffle(shuffle((X|X) ) ) ) ) ,-7) ,7) ) ,7) ) ) ,7) ) ) +transpose((((transpose(step(step(shuffle(transpose((X+(X+transpose(X,7) ) ) ,-7) ) ,12) ,12) ,-5) +transpose((arpeggio(transpose(transpose(transpose(shuffle(X) ,-7) ,-7) ,-5) ) |((step(shuffle((X+transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,7) ) ) ,12) +transpose(transpose(shuffle(transpose(shuffle(step((X+X) ,12) ) ,-7) ) ,4) ,12) ) +transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(step(transpose(X,-5) ,12) ,12) ,12) ) ) ,7) ) ) ,12) ) +transpose((shuffle(transpose((shuffle((transpose(arpeggio(X) ,-5) +transpose(arpeggio(transpose((X|step(X,12) ) ,-7) ) ,7) ) ) +transpose(arpeggio((step(arpeggio(arpeggio(X) ) ,12) +transpose(((X|X) +transpose(((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,7) ) ) ,12) ) ,4) ) +transpose(arpeggio(echo(transpose((step(((X|X) +transpose((X+transpose(X,7) ) ,12) ) ,12) +transpose(echo(arpeggio((transpose(X,-5) +transpose(transpose(X,-5) ,12) ) ) ,4,6) ,12) ) ,-5) ,4,6) ) ,7) ) ,4) ) +transpose(arpeggio(echo(((((arpeggio(step(step((X+transpose(X,12) ) ,12) ,12) ) |(step(transpose(X,-7) ,12) +transpose(X,-7) ) ) +transpose(((shuffle((X+(X+X) ) ) +transpose(transpose(arpeggio((echo(shuffle((X+X) ) ,4,6) +step(transpose(X,4) ,12) ) ) ,-5) ,12) ) +transpose(transpose(step(arpeggio(((X|X) +transpose(shuffle(X) ,12) ) ) ,12) ,4) ,4) ) ,4) ) +transpose((step(shuffle((((X+transpose(X,12) ) |shuffle(X) ) |(X|X) ) ) ,12) +shuffle(echo(((X|X) +step(X,12) ) ,4,6) ) ) ,7) ) |(arpeggio((arpeggio(arpeggio(arpeggio(transpose(X,-7) ) ) ) |(X|X) ) ) |(step(arpeggio(echo(echo(X,4,6) ,4,6) ) ,12) +transpose(step(transpose((step((((X|X) +transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(X,7) ) ,-5) ,12) ,12) ) ) ) ,4,6) ) ,7) ) ,12) ) ) +(transpose((step(arpeggio(transpose(arpeggio(shuffle(X) ) ,4) ) ,12) +transpose(step(transpose(((transpose(((step(echo((X|X) ,4,6) ,12) +transpose(arpeggio(((X+transpose(X,12) ) |(transpose(X,4) +transpose(X,-5) ) ) ) ,4) ) +transpose((shuffle(transpose(transpose(X,-5) ,-7) ) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) ) ,7) ) ,4) +transpose(step((transpose(arpeggio((X+transpose(step(X,12) ,12) ) ) ,-7) +(X+transpose(X,12) ) ) ,12) ,-7) ) +transpose((echo(transpose((X|transpose(X,4) ) ,4) ,4,6) +transpose((((transpose(shuffle(X) ,-5) +((X|X) +X) ) +shuffle(shuffle(transpose(X,-5) ) ) ) +transpose(shuffle(transpose(transpose(transpose(X,4) ,-7) ,4) ) ,7) ) ,12) ) ,12) ) ,-7) ,12) ,12) ) ,-5) +transpose(((transpose((transpose(echo(((transpose(X,-7) +transpose(X,4) ) +transpose(step(shuffle((shuffle(shuffle(X) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ,12) ) ,4,6) ,-7) +transpose((((transpose(shuffle(transpose(arpeggio(arpeggio(X) ) ,-5) ) ,-5) +transpose(step(step(transpose(transpose(step(X,12) ,-5) ,-7) ,12) ,12) ,4) ) +transpose((transpose(X,-5) |(X+X) ) ,7) ) +transpose((step((X|step(X,12) ) ,12) +arpeggio(shuffle((X|X) ) ) ) ,12) ) ,12) ) ,-7) |transpose(transpose(echo(transpose(transpose(arpeggio(X) ,-5) ,-7) ,4,6) ,-7) ,-7) ) +transpose(((shuffle(arpeggio(step(transpose(arpeggio(step(transpose((transpose(X,4) +transpose(arpeggio(X) ,12) ) ,-7) ,12) ) ,4) ,12) ) ) +transpose(shuffle(arpeggio((arpeggio((transpose(((X+transpose(X,7) ) +X) ,4) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,-5) ) ) |(shuffle(arpeggio((X|X) ) ) +arpeggio(echo(X,4,6) ) ) ) ) ) ,4) ) +transpose(transpose(shuffle((transpose(arpeggio(arpeggio(X) ) ,-5) |arpeggio(step(echo(X,4,6) ,12) ) ) ) ,4) ,7) ) ,12) ) ,7) ) ) random seed used was 0
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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