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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: | step((((((echo(X,4,6) +transpose(step(X,12) ,7) ) +transpose(step(transpose(X,-5) ,12) ,7) ) +transpose(echo((transpose(transpose(echo(step(transpose(arpeggio(X) ,4) ,12) ,4,6) ,4) ,4) +transpose(transpose((X|X) ,4) ,12) ) ,4,6) ,4) ) +transpose(step(transpose(echo(step(transpose((X+transpose(X,4) ) ,-7) ,12) ,4,6) ,4) ,12) ,7) ) +transpose(transpose(shuffle(shuffle(transpose(arpeggio(transpose(transpose(echo(X,4,6) ,-5) ,-7) ) ,4) ) ) ,-7) ,7) ) ,12) random seed used was 1367631
EXPR = ((((((((arpeggio(transpose((transpose(X,4) |shuffle(X) ) ,-5) ) |transpose(transpose(echo(shuffle(transpose(X,4) ) ,4,6) ,-5) ,4) ) +transpose(step(step((((X+transpose((transpose(transpose(X,-5) ,4) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) +transpose(transpose(shuffle((arpeggio(transpose(X,-5) ) +((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,-5) ,4) ) +transpose(transpose(step(step(X,12) ,12) ,4) ,7) ) ,12) ,12) ,4) ) +transpose((((transpose(echo(X,4,6) ,4) +transpose((transpose((echo(X,4,6) |(transpose(X,4) +transpose(echo(X,4,6) ,7) ) ) ,-5) +X) ,7) ) |((transpose(X,4) +transpose(((X+transpose(X,7) ) +X) ,-7) ) +transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,12) ) ) |(arpeggio(echo((arpeggio(transpose(X,-5) ) |transpose(X,4) ) ,4,6) ) +transpose(transpose(transpose(shuffle(X) ,-7) ,-7) ,7) ) ) ,7) ) |echo(transpose(step(X,12) ,4) ,4,6) ) |((arpeggio((transpose((echo(step(X,12) ,4,6) |(transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,-7) +(arpeggio(shuffle(transpose(X,4) ) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) ) +transpose(transpose(transpose(shuffle(arpeggio((transpose(shuffle(transpose((X+transpose(X,12) ) ,-5) ) ,-7) +transpose(transpose(X,-5) ,7) ) ) ) ,-5) ,-7) ,4) ) +transpose(((((transpose(X,4) +(transpose(transpose(transpose(X,4) ,4) ,-7) +transpose(transpose(transpose(arpeggio(X) ,-5) ,4) ,12) ) ) +transpose(transpose((transpose(echo(transpose(X,-5) ,4,6) ,-7) +(transpose(X,-5) +transpose(shuffle(X) ,-7) ) ) ,-5) ,4) ) |transpose(step(step((transpose(arpeggio(X) ,-7) |step((X+X) ,12) ) ,12) ,12) ,-5) ) +transpose((transpose(((X+transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,-7) +transpose(transpose((transpose((transpose(X,-5) +X) ,4) |(echo((X+transpose(X,7) ) ,4,6) |(transpose(X,-7) +transpose(transpose(X,-7) ,12) ) ) ) ,-7) ,7) ) ,12) ) ,7) ) ) +transpose((step(transpose(transpose((transpose((arpeggio((X+transpose(X,4) ) ) +transpose(echo(X,4,6) ,7) ) ,-7) |transpose(((((echo(X,4,6) +transpose(step(X,12) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(X,12) ) +transpose(arpeggio(shuffle(shuffle(X) ) ) ,12) ) ,4) ) ,-7) ,4) ,12) +(transpose(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose(transpose(transpose(echo(X,4,6) ,4) ,-5) ,4) ) +transpose((X+X) ,7) ) ,4) ,4) |shuffle((((transpose((X|X) ,-7) +transpose(((transpose(X,4) |X) +transpose(((X+transpose(X,7) ) |(X+transpose(X,7) ) ) ,7) ) ,7) ) +(((shuffle(arpeggio(echo(X,4,6) ) ) |shuffle((echo(((X+transpose(X,7) ) |arpeggio(X) ) ,4,6) |transpose(X,4) ) ) ) +transpose(step((transpose(arpeggio(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ,-5) +transpose(transpose((X|X) ,4) ,12) ) ,12) ,4) ) +transpose((transpose((X|(X+transpose(X,7) ) ) ,4) +transpose(((transpose(X,4) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |transpose(arpeggio(transpose(X,-5) ) ,4) ) ,12) ) ,7) ) ) +transpose((arpeggio(((echo(arpeggio(step(X,12) ) ,4,6) +arpeggio((step((X+transpose(X,7) ) ,12) +transpose(X,7) ) ) ) +transpose(echo(transpose((shuffle(X) +transpose(X,7) ) ,-5) ,4,6) ,7) ) ) +transpose((transpose(echo(X,4,6) ,4) +transpose(transpose(X,4) ,12) ) ,4) ) ,12) ) ) ) ) ,7) ) +transpose(transpose(transpose(step(transpose(transpose((arpeggio((transpose(echo(transpose(X,4) ,4,6) ,4) +transpose((echo(step(transpose(X,4) ,12) ,4,6) +transpose(echo(((X+transpose(transpose(X,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ,4,6) ,7) ) ,12) ) ) |((arpeggio(transpose(transpose(transpose(X,4) ,-5) ,4) ) +transpose(arpeggio(transpose(transpose(X,4) ,4) ) ,7) ) +transpose(((transpose(((arpeggio(X) +transpose(transpose(X,4) ,7) ) |X) ,4) +transpose(transpose(X,4) ,12) ) +transpose(step(step(X,12) ,12) ,7) ) ,12) ) ) ,-7) ,4) ,12) ,-7) ,-5) ,4) ) +transpose((transpose(transpose((X+transpose(transpose((((((transpose((X+transpose(X,12) ) ,-7) +transpose(X,7) ) +echo(transpose((X+X) ,-7) ,4,6) ) +transpose(transpose((((X+transpose(X,7) ) +transpose(X,4) ) +X) ,-5) ,4) ) +transpose(((X+transpose(X,7) ) |X) ,7) ) +transpose((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-5) |(((X|X) +transpose(transpose((X+X) ,-5) ,4) ) +transpose(step(X,12) ,7) ) ) ,7) ) ,-5) ,12) ) ,-5) ,4) +transpose(((((transpose(shuffle((X+transpose(X,7) ) ) ,-7) +transpose(shuffle(X) ,-5) ) |transpose(echo((transpose(X,4) +transpose(X,7) ) ,4,6) ,-5) ) |transpose(transpose(shuffle((transpose(X,-5) |transpose((X+transpose(X,7) ) ,-5) ) ) ,-7) ,-5) ) +transpose(step(arpeggio(shuffle(transpose((X|echo(transpose(X,4) ,4,6) ) ,-7) ) ) ,12) ,4) ) ,12) ) ,7) ) random seed used was 0
EXPR = transpose(transpose(((transpose(arpeggio(step(transpose(step(transpose(X,-7) ,12) ,4) ,12) ) ,-7) +shuffle(shuffle((transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose(((X|X) |X) ,7) ) +transpose((transpose(transpose(X,-5) ,4) |((X|X) +(X+X) ) ) ,4) ) +transpose((X|arpeggio((X|X) ) ) ,7) ) ,-5) |(shuffle(transpose(shuffle(X) ,4) ) |transpose(transpose(transpose(transpose(X,-7) ,4) ,-5) ,4) ) ) ) ) ) |transpose(transpose(arpeggio(transpose(step(transpose(transpose(X,4) ,4) ,12) ,4) ) ,-5) ,-5) ) ,-7) ,-7) random seed used was 0
EXPR = step((shuffle(((shuffle(echo(step((((step(X,12) +transpose(X,4) ) +transpose((arpeggio(X) +transpose((X|X) ,12) ) ,7) ) |echo((X+(X+transpose(X,12) ) ) ,4,6) ) ,12) ,4,6) ) |((((transpose(((transpose(X,4) +transpose(arpeggio(X) ,7) ) |transpose(((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) ) ,-7) |transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((transpose((X+transpose(X,7) ) ,-5) +transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,-7) ) +transpose(transpose(transpose((transpose(X,4) +transpose(((X|X) +transpose(X,7) ) ,7) ) ,-7) ,-7) ,4) ) +transpose((transpose((transpose(X,4) +transpose(X,12) ) ,-7) +transpose(X,12) ) ,7) ) +transpose(((step(((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) +transpose((arpeggio(X) +transpose(transpose(step(transpose(X,-5) ,12) ,-5) ,12) ) ,7) ) |(((((((arpeggio(X) +transpose(step(X,12) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((arpeggio(X) |echo(transpose(X,-5) ,4,6) ) ,4) ) +transpose(step(echo((((X|X) +transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ,7) ) ) ,7) ) ) |transpose(shuffle(((echo(step(((X+transpose(transpose(X,-5) ,4) ) +transpose(((X|X) +transpose(X,12) ) ,7) ) ,12) ,4,6) +transpose(transpose(transpose(((((X+transpose(X,7) ) |transpose(X,-7) ) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose((((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) ,-5) ,4) ,7) ) +transpose(transpose(transpose(transpose(transpose(arpeggio((echo(X,4,6) +X) ) ,-7) ,-7) ,4) ,4) ,12) ) ) ,4) ) ) +transpose(((transpose((transpose((echo(X,4,6) |transpose((X+transpose(X,12) ) ,-7) ) ,4) +transpose((arpeggio(X) +transpose(transpose(step(X,12) ,-5) ,7) ) ,7) ) ,4) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose(shuffle(X) ,7) ) ,12) ) ) |transpose(transpose(transpose((transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ) ,4) |arpeggio((transpose(X,-5) |(X+transpose(echo(X,4,6) ,7) ) ) ) ) ,4) ,-5) ,-7) ) ,4) ) ,12) 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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