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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: | (step(shuffle((transpose(echo(transpose(shuffle(transpose(((transpose(X,-5) +transpose(X,-5) ) |transpose(step(X,12) ,-5) ) ,4) ) ,-5) ,4,6) ,-5) +transpose((transpose((shuffle(((((step((transpose(echo(X,4,6) ,-5) +transpose(transpose((transpose(X,-5) |(X|X) ) ,-5) ,7) ) ,12) |transpose(transpose(X,-7) ,4) ) +transpose((((transpose(X,-5) +transpose(shuffle(shuffle(X) ) ,7) ) +transpose(arpeggio(X) ,7) ) +(X+transpose(X,-5) ) ) ,4) ) +transpose((((((transpose(X,4) +X) +transpose((transpose(X,4) |X) ,7) ) +transpose(((X+transpose(X,7) ) +X) ,4) ) +transpose(transpose(shuffle(X) ,-7) ,7) ) +(arpeggio(echo(transpose(step(X,12) ,-5) ,4,6) ) +transpose(shuffle((X|X) ) ,-5) ) ) ,7) ) |((transpose(shuffle(((shuffle(((X|X) |transpose(X,-7) ) ) +transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ) ,4) ) +transpose((X+(transpose(X,-5) +transpose((transpose((X+transpose(X,12) ) ,-7) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,7) ) ) ,7) ) ) ,-7) +transpose(shuffle(transpose(((X+X) |transpose(shuffle(X) ,-7) ) ,-5) ) ,12) ) +(((transpose(echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) ,-7) +transpose((shuffle(transpose(transpose(step(X,12) ,-5) ,-5) ) +transpose(transpose(shuffle(X) ,-5) ,12) ) ,12) ) +transpose((transpose(((X+transpose(X,12) ) +echo(X,4,6) ) ,4) |((X+transpose(arpeggio((X+transpose(transpose(X,4) ,7) ) ) ,4) ) +transpose(X,7) ) ) ,12) ) |(transpose(echo(transpose(X,4) ,4,6) ,4) +transpose(arpeggio(transpose(transpose(shuffle(X) ,-7) ,4) ) ,-7) ) ) ) ) ) +shuffle((step(transpose(echo(transpose(echo(((((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,4,6) ,-7) ,4,6) ,4) ,12) |shuffle((step(arpeggio((X|arpeggio(shuffle(X) ) ) ) ,12) |transpose(shuffle(shuffle(transpose(shuffle((X|X) ) ,-7) ) ) ,4) ) ) ) ) ) ,-5) |step(transpose(((transpose(echo(X,4,6) ,4) +transpose(echo(transpose(shuffle(shuffle(X) ) ,-5) ,4,6) ,12) ) |((X|X) |(X+transpose(transpose(X,4) ,7) ) ) ) ,4) ,12) ) ,7) ) ) ,12) +transpose(transpose(shuffle(((transpose(step(transpose((echo(transpose(echo(shuffle(((transpose(transpose((transpose(echo(X,4,6) ,-5) |shuffle(shuffle(X) ) ) ,4) ,-5) +transpose(((X+X) +transpose(transpose((X|X) ,-7) ,7) ) ,7) ) +transpose((transpose(transpose(X,-5) ,-5) |(step(X,12) +transpose((X+X) ,12) ) ) ,-7) ) ) ,4,6) ,-7) ,4,6) +transpose(shuffle(shuffle((echo(transpose((step(transpose(transpose(X,-5) ,4) ,12) +transpose(echo(X,4,6) ,7) ) ,4) ,4,6) +transpose(echo(X,4,6) ,-7) ) ) ) ,-7) ) ,-5) ,12) ,-5) +transpose(transpose((shuffle(transpose(transpose(((transpose(((X+transpose(transpose(X,-5) ,7) ) |(X|X) ) ,-7) +transpose((transpose(transpose(arpeggio(X) ,-7) ,-7) +transpose(((shuffle(X) +(transpose(X,4) +(X+X) ) ) +transpose(transpose((echo(X,4,6) +(X|X) ) ,4) ,7) ) ,12) ) ,7) ) +transpose(arpeggio(transpose(((X|(transpose(X,-7) +transpose(shuffle(X) ,12) ) ) +shuffle(transpose((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(shuffle(transpose(X,-5) ) ,12) ) ,4) ) ) ,4) ) ,7) ) ,4) ,-5) ) +transpose(step(shuffle(transpose(shuffle(step((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) |shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) ,-7) ) ,12) ,7) ) ,-7) ,12) ) +transpose(step((((transpose(echo(((((X+transpose(X,12) ) |X) +(transpose(transpose(transpose(shuffle(X) ,4) ,-7) ,-5) +transpose(transpose(((X+X) +transpose(X,-5) ) ,-5) ,12) ) ) +((transpose(transpose((shuffle(X) +transpose(X,12) ) ,-5) ,-7) +transpose(step(((arpeggio((((X+X) +X) +transpose(transpose(X,4) ,4) ) ) +transpose(shuffle((shuffle(X) +transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) ) ,4) ) +transpose(echo(((X+X) +transpose(X,-7) ) ,4,6) ,7) ) ,12) ,4) ) +transpose(transpose(((X|X) +(shuffle(X) +transpose(echo(X,4,6) ,7) ) ) ,-7) ,7) ) ) ,4,6) ,4) +transpose(shuffle(arpeggio(shuffle((transpose(((echo(transpose(X,-5) ,4,6) +transpose(((X|echo(X,4,6) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose(((((X|X) +transpose(X,7) ) |shuffle(X) ) |transpose((X+echo(X,4,6) ) ,4) ) ,12) ) ,-5) +transpose(transpose(transpose((((arpeggio(X) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +((X+transpose((X|X) ,4) ) +transpose(X,7) ) ) ,4) ,-7) ,7) ) ) ) ) ,7) ) +((transpose(transpose(((echo(step(transpose((X+X) ,-7) ,12) ,4,6) +transpose(((shuffle(shuffle(X) ) +arpeggio(shuffle(X) ) ) +shuffle(transpose(transpose(X,-5) ,-7) ) ) ,4) ) +transpose((shuffle(shuffle(shuffle(X) ) ) +transpose((arpeggio(transpose(echo(X,4,6) ,4) ) +(shuffle(X) +((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,12) ) ,7) ) ,4) ,-7) +transpose(step(transpose(((echo(((X+transpose(X,12) ) +transpose(shuffle(X) ,12) ) ,4,6) |transpose(X,-7) ) +transpose(transpose((shuffle(shuffle(arpeggio(X) ) ) +transpose(shuffle((transpose(X,-5) |(X+transpose(X,12) ) ) ) ,12) ) ,4) ,7) ) ,-7) ,12) ,12) ) +transpose(echo((shuffle(transpose(step(((X+X) +X) ,12) ,-5) ) +((((X|shuffle((X+X) ) ) +((echo(X,4,6) |(X+transpose(X,12) ) ) +transpose(X,-5) ) ) +transpose(step(shuffle(X) ,12) ,4) ) +transpose(shuffle((shuffle(X) +transpose(transpose(X,-7) ,-5) ) ) ,7) ) ) ,4,6) ,7) ) ) +transpose(shuffle((arpeggio((echo(transpose(X,-5) ,4,6) |(shuffle(transpose(shuffle(arpeggio(X) ) ,-5) ) +(echo(X,4,6) |(transpose(transpose((X+transpose(X,7) ) ,4) ,4) +transpose(transpose((X|(X+transpose(X,12) ) ) ,-5) ,12) ) ) ) ) ) +transpose((((arpeggio(transpose(step(transpose((X|X) ,-7) ,12) ,-7) ) +transpose(((echo(transpose(X,-5) ,4,6) |X) |transpose(transpose(shuffle(transpose(X,-5) ) ,-5) ,-7) ) ,7) ) +transpose((shuffle(((((((X+X) |(X|(X|X) ) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) +transpose((X+step((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(transpose(((X+transpose(X,7) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ,4) ,7) ) ) +transpose((((transpose(X,-7) +transpose(arpeggio(X) ,12) ) +arpeggio(((X+transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) +(X+transpose((X+X) ,7) ) ) ) ) +transpose(shuffle(transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) ,12) ) ,12) ) ,4) ) +transpose(((transpose(transpose(((((X+X) +transpose((X|X) ,12) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,7) ) ,-7) ,-5) +transpose((transpose(((shuffle(X) +transpose((X|X) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) +transpose((arpeggio(((X|X) |arpeggio(X) ) ) +transpose((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose((transpose(transpose(X,-5) ,-5) |(X|X) ) ,7) ) ,12) ) ,7) ) ,4) ) +transpose(shuffle(((((shuffle(X) +transpose(X,12) ) |step(X,12) ) +transpose((shuffle(step(X,12) ) +transpose(X,7) ) ,12) ) |shuffle((transpose(X,4) +(X+X) ) ) ) ) ,7) ) ,7) ) ,7) ) ) ,7) ) ,12) ,12) ) ) ,4) ,7) ) random seed used was 197843243
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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