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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(transpose((transpose(shuffle((((transpose(((X+X) |transpose(X,-7) ) ,-7) |((echo(X,4,6) |X) +transpose(X,7) ) ) +transpose(step(transpose(((X+X) |((X+transpose(X,7) ) +transpose(X,4) ) ) ,-7) ,12) ,7) ) +transpose((((transpose(X,-7) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,-5) ) ) ,4) +transpose((transpose((((transpose(X,4) |(X+transpose(X,7) ) ) +arpeggio((X+X) ) ) +transpose(step(echo(transpose((X+X) ,4) ,4,6) ,12) ,12) ) ,-7) +transpose((((((((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) |shuffle(transpose(X,-7) ) ) +transpose((((transpose(X,4) +transpose(((step(X,12) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,7) ) +transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose(((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |(X+transpose(X,12) ) ) ,7) ) ,7) ) |transpose(transpose(((transpose((transpose(X,4) +transpose((X|X) ,12) ) ,-7) +transpose(transpose(transpose((X|X) ,-7) ,-7) ,4) ) +transpose(((shuffle(X) +X) +(transpose(X,-5) |X) ) ,7) ) ,-7) ,-7) ) |transpose(transpose(arpeggio(shuffle((transpose(arpeggio(X) ,-7) +(X|X) ) ) ) ,4) ,-5) ) +transpose(transpose(((transpose((transpose(echo(X,4,6) ,4) |((X+transpose(transpose(X,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,-7) +arpeggio(step(transpose(echo(X,4,6) ,-5) ,12) ) ) +((((((X+X) +transpose((X|X) ,12) ) +transpose(step(X,12) ,7) ) |step(X,12) ) |transpose(X,-7) ) +transpose(shuffle((X+X) ) ,-5) ) ) ,4) ,4) ) +transpose((((transpose(transpose((((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +(X+X) ) ,4) ,4) +transpose(transpose(transpose(((X|X) +transpose(transpose(X,-5) ,7) ) ,-7) ,-7) ,7) ) |((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) +transpose((((X+transpose(X,12) ) +transpose((X+X) ,12) ) +X) ,7) ) +transpose(transpose((X+transpose(transpose(X,-5) ,12) ) ,4) ,12) ) ) +(transpose((echo((X+transpose(X,7) ) ,4,6) +(transpose(X,-7) +transpose((X+X) ,7) ) ) ,-5) +transpose((X+(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,-7) ) ) ,7) ) +transpose(step(step(transpose((transpose((transpose(X,-7) +X) ,-7) |(transpose(shuffle(X) ,-5) +transpose((X+X) ,12) ) ) ,4) ,12) ,12) ,7) ) ,7) ) ,12) ) ,4) ) random seed used was 3442951
EXPR = (shuffle(transpose(transpose(shuffle((((((X+transpose(X,7) ) +transpose(X,7) ) +transpose(shuffle(echo(X,4,6) ) ,-5) ) |((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) +shuffle((X+X) ) ) ,12) ) |(transpose(arpeggio(X) ,-7) +transpose(shuffle(shuffle(shuffle(X) ) ) ,7) ) ) ) +transpose(((transpose(step(X,12) ,4) +((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ) +transpose((transpose(X,-5) +transpose((shuffle(transpose(X,4) ) |transpose((X|X) ,-7) ) ,12) ) ,7) ) ,7) ) ) ,4) ,-7) ) +transpose((echo(transpose(step(arpeggio(transpose((step(X,12) +step((X+transpose(X,7) ) ,12) ) ,4) ) ,12) ,-5) ,4,6) +arpeggio(transpose(echo(((X+transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ,-5) ) ) ,-5) ) random seed used was 0
EXPR = transpose((((echo(((transpose(echo(transpose(X,-7) ,4,6) ,-5) +transpose(echo(step(X,12) ,4,6) ,-7) ) +(echo(transpose(echo(X,4,6) ,-5) ,4,6) +transpose((transpose(X,-5) +transpose(((((X+X) |(X|X) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,7) ) ) ,4,6) |((transpose(transpose(X,4) ,4) +transpose(((transpose(X,-5) |shuffle(transpose(X,4) ) ) +transpose((echo(X,4,6) +transpose(arpeggio(X) ,12) ) ,7) ) ,7) ) +((transpose(((X+transpose(X,7) ) |transpose(X,4) ) ,-5) +((transpose(X,-7) +transpose(X,4) ) +transpose((X+X) ,7) ) ) +transpose(step((((transpose(X,-5) +transpose(step(X,12) ,7) ) |X) +transpose((((X|X) |((transpose(X,-7) +transpose(transpose(X,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ) |transpose(((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) ,12) ) ,12) ,12) ) ) ) +transpose(transpose((transpose(echo(transpose(transpose(X,4) ,-7) ,4,6) ,-5) +step((transpose((((X+X) +(X|X) ) +((X+X) +transpose(echo(X,4,6) ,12) ) ) ,-7) +transpose(arpeggio((X+((step(X,12) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ) ) ,-7) ) ,12) ) ,-5) ,4) ) +transpose(((transpose(echo(transpose(transpose((transpose(echo(X,4,6) ,-5) +transpose((((X+transpose(X,7) ) +transpose((X+X) ,4) ) +transpose((X+X) ,7) ) ,12) ) ,4) ,-5) ,4,6) ,-7) +transpose(((echo((arpeggio(X) +transpose(step(X,12) ,12) ) ,4,6) |transpose(((((X+transpose((X+transpose(X,7) ) ,7) ) +transpose(step(X,12) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +(shuffle(X) +transpose(step(echo(transpose(X,4) ,4,6) ,12) ,12) ) ) ,-5) ) +transpose(((((((X|X) +transpose((X+transpose(transpose(X,4) ,7) ) ,7) ) +transpose((X|X) ,12) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) +transpose(((((echo(echo(transpose(X,4) ,4,6) ,4,6) +transpose(transpose(echo(X,4,6) ,-5) ,4) ) +transpose((X+X) ,7) ) |transpose(transpose(X,4) ,-7) ) +transpose((transpose(X,-5) |shuffle(transpose(echo(X,4,6) ,-7) ) ) ,7) ) ,4) ) +transpose(((transpose(X,-5) +transpose(X,4) ) |(transpose(X,-5) +transpose(arpeggio(X) ,7) ) ) ,7) ) ,12) ) ,4) ) +transpose(transpose((step(((transpose(transpose((transpose(X,4) |X) ,-7) ,-5) +transpose(transpose((X+X) ,-5) ,4) ) +transpose(transpose(((X|arpeggio(X) ) |transpose(X,-7) ) ,4) ,7) ) ,12) +transpose((transpose(X,4) |(arpeggio(X) +((X+transpose(X,7) ) +transpose(X,-7) ) ) ) ,-7) ) ,4) ,7) ) ,7) ) ,4) random seed used was 0
EXPR = arpeggio(transpose((transpose(transpose((echo((((X|X) +transpose((X|X) ,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) +transpose((X|X) ,12) ) ,4) ,-5) +transpose(transpose((((arpeggio(step((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) |transpose(((arpeggio(X) +transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) ,12) ) +transpose(((transpose(transpose(transpose(X,-5) ,-5) ,-7) +transpose(transpose(transpose((((X+transpose(X,12) ) +transpose(transpose((X|X) ,-5) ,4) ) +transpose(((X+transpose(X,12) ) +transpose((X+X) ,7) ) ,7) ) ,4) ,-5) ,7) ) |arpeggio((arpeggio(X) |(transpose((X+X) ,-5) +(((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) ) ) ) ,4) ) +transpose(step(((X+transpose(echo(step(X,12) ,4,6) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,12) ,7) ) +transpose((transpose(step(transpose(transpose((X|X) ,4) ,4) ,12) ,-7) |arpeggio(transpose(shuffle((transpose(X,-5) +transpose((transpose(X,-7) |echo(X,4,6) ) ,12) ) ) ,4) ) ) ,-7) ) ,4) ,12) ) ,-5) ) 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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