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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 15 generations the expression "X" became this: | shuffle((shuffle((((step(((step(transpose(X,-5) ,12) +transpose(transpose(echo(X,4,6) ,-5) ,4) ) +transpose(step(X,12) ,7) ) ,12) +transpose(transpose((((echo(X,4,6) +transpose(echo(X,4,6) ,4) ) +echo(echo(X,4,6) ,4,6) ) +transpose((((X|step(X,12) ) +(X+transpose(X,7) ) ) +transpose((arpeggio(X) +X) ,-5) ) ,12) ) ,-7) ,12) ) +transpose(echo((step((((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(X,-5) ) |step(transpose(X,-7) ,12) ) ,12) +transpose((transpose(transpose(X,-7) ,-7) +(X|X) ) ,12) ) ,4,6) ,4) ) +transpose(echo(echo(((transpose(echo(X,4,6) ,4) +(transpose(transpose(echo(X,4,6) ,-7) ,-5) |(X+transpose(X,7) ) ) ) +(echo(X,4,6) +transpose((X+X) ,12) ) ) ,4,6) ,4,6) ,12) ) ) +(((transpose(transpose(((X+X) |transpose(X,4) ) ,-5) ,4) +transpose((transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) +transpose(shuffle(transpose(shuffle(X) ,4) ) ,4) ) ,12) ) +((echo((X+X) ,4,6) +transpose(arpeggio(X) ,7) ) |transpose(arpeggio((X+X) ) ,-5) ) ) +transpose(shuffle((((transpose(transpose((X+echo(X,4,6) ) ,4) ,-7) +step(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,12) ) +transpose((shuffle(X) |shuffle((X|X) ) ) ,4) ) +transpose((transpose(transpose(X,-7) ,4) |(shuffle(X) +arpeggio(transpose(X,-5) ) ) ) ,7) ) ) ,12) ) ) ) random seed used was 10
EXPR = (transpose(((transpose(transpose((step(X,12) |arpeggio(X) ) ,4) ,-7) +transpose(((transpose(step(X,12) ,-7) +transpose((transpose(((transpose(X,-7) +transpose((X+X) ,12) ) |(X+transpose(X,7) ) ) ,-5) |step(echo(X,4,6) ,12) ) ,7) ) +transpose((transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4) +transpose(transpose((transpose(X,-7) +transpose((X+transpose(X,-7) ) ,7) ) ,-5) ,7) ) ,4) ) ,7) ) +(transpose((((transpose(step(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ,-5) +transpose((transpose(((shuffle(X) +transpose(X,4) ) +transpose((X+X) ,7) ) ,-7) |transpose(X,-5) ) ,7) ) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose((transpose(shuffle((transpose(X,4) +transpose(X,-5) ) ) ,-5) +transpose((((X+X) |(X|X) ) |((step(X,12) +transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,4) ) +transpose((X|X) ,7) ) ) ,12) ) ,7) ) ,-5) |(arpeggio((transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) +transpose((arpeggio(X) |(step(X,12) +arpeggio(X) ) ) ,7) ) ) +transpose((step((X|transpose(X,4) ) ,12) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) ,-7) ) ) ) ,-7) |(transpose(transpose(step(((step(step(X,12) ,12) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ,-5) ,-7) |arpeggio((((transpose(transpose(((((X|X) |(X+X) ) +((X+transpose(X,7) ) +transpose((X+X) ,7) ) ) +((transpose(X,4) +transpose(X,4) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ) ,-7) ,-7) +transpose(shuffle((transpose((transpose(transpose((X+transpose(X,12) ) ,4) ,-7) |(transpose((X|X) ,4) +(((X+transpose(X,4) ) +transpose(X,7) ) +step(X,12) ) ) ) ,-7) +transpose(transpose(transpose((X|transpose(transpose(X,-5) ,-5) ) ,-7) ,-7) ,12) ) ) ,7) ) +transpose(transpose(transpose((arpeggio(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,-7) ) +transpose((transpose(((transpose(X,4) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) +transpose(transpose(shuffle(X) ,-7) ,12) ) ,7) ) ,-7) ,4) ,4) ) +transpose((transpose(((step(echo(transpose(transpose(echo(X,4,6) ,-7) ,4) ,4,6) ,12) +transpose(arpeggio(step((X+X) ,12) ) ,4) ) +transpose(transpose((((X+transpose(((X+X) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +transpose(X,12) ) |echo(transpose(((X+transpose(X,7) ) +X) ,4) ,4,6) ) ,-5) ,7) ) ,-7) +(((step((X+transpose(X,12) ) ,12) +((X|X) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(transpose((transpose((((X+X) +transpose(step(X,12) ,4) ) +transpose((X+X) ,7) ) ,-7) +transpose((((X|X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,12) ) ,4) ,12) ) +(echo((step(transpose(X,4) ,12) +(((step(X,12) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +step((X|X) ,12) ) ) ,4,6) +transpose((echo(((X+transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4,6) |transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) ) ,7) ) ) ) ,7) ) ) ) ) random seed used was 0
EXPR = transpose(transpose(arpeggio((transpose((((((X+transpose(shuffle(arpeggio(X) ) ,7) ) |(arpeggio(transpose(step((X|X) ,12) ,4) ) |((transpose((((transpose(X,-5) +transpose((X+X) ,12) ) +transpose((transpose(X,4) +(X|X) ) ,7) ) |echo((transpose(X,4) +X) ,4,6) ) ,4) +transpose(transpose((transpose(step((X|X) ,12) ,4) +step((X|X) ,12) ) ,-5) ,4) ) +transpose((transpose(X,4) +transpose(X,-5) ) ,7) ) ) ) +((step((transpose((X+transpose(X,12) ) ,-5) |echo(shuffle(X) ,4,6) ) ,12) +transpose(transpose(echo(((transpose(X,-5) +transpose(X,12) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ,4,6) ,-5) ,4) ) +transpose(((((echo(X,4,6) +transpose(arpeggio((X+X) ) ,12) ) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) +transpose((X+X) ,-5) ) ) +transpose(transpose(shuffle(echo(X,4,6) ) ,-5) ,7) ) +transpose(step(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +shuffle(X) ) ,-7) ,12) ,7) ) ,7) ) ) +transpose(arpeggio(step(transpose(((transpose(transpose(transpose(X,-7) ,4) ,-5) +transpose((shuffle(X) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose(((X+transpose((X+transpose(X,12) ) ,12) ) |transpose((transpose(X,-7) |X) ,4) ) ,12) ) ,-7) ,12) ) ,4) ) +transpose(transpose(step((arpeggio(X) +transpose((transpose(X,-7) |(X+transpose(X,7) ) ) ,12) ) ,12) ,-5) ,7) ) ,4) +transpose(arpeggio(transpose((step(((X|X) |(X|X) ) ,12) +transpose(transpose((((X+transpose((X+transpose(X,12) ) ,12) ) +transpose((X|X) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,-7) ,-5) ) ,4) ) ,-5) ) ) ,-7) ,-5) random seed used was 0
EXPR = (transpose(transpose(transpose(((transpose(((arpeggio(X) +step(arpeggio(X) ,12) ) +transpose((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ) ,4) +transpose(((X+transpose(transpose(X,4) ,-7) ) +transpose((((echo(X,4,6) +(X|X) ) |transpose((X+transpose(X,12) ) ,4) ) |X) ,12) ) ,7) ) +transpose(((echo(transpose(X,-5) ,4,6) |echo(X,4,6) ) +transpose(X,12) ) ,-7) ) ,-5) ,4) ,-5) |transpose((((arpeggio(echo(transpose(X,-7) ,4,6) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) ,4) ) +transpose(transpose(arpeggio(arpeggio((X+transpose(X,12) ) ) ) ,-7) ,7) ) +((step((X+transpose(X,12) ) ,12) +transpose(((X|X) +((((X+transpose(X,4) ) +transpose(X,7) ) |X) |(X|X) ) ) ,12) ) +transpose(transpose(transpose((transpose(((X+transpose(X,12) ) +X) ,-5) +(echo((X|X) ,4,6) |arpeggio(X) ) ) ,-5) ,-5) ,7) ) ) ,4) ) 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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