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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(((transpose(transpose(transpose(transpose(transpose((X+shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-5) ,-7) ,-5) ,-7) ,4) +transpose(((((X+X) +transpose(X,12) ) +transpose(step(echo((transpose((shuffle(X) +transpose(shuffle((X+transpose(X,12) ) ) ,12) ) ,4) |arpeggio(arpeggio((X|X) ) ) ) ,4,6) ,12) ,-5) ) +transpose(transpose(shuffle(arpeggio(((X|X) |step(transpose(X,-7) ,12) ) ) ) ,-5) ,12) ) ,4) ) +transpose(step((((((transpose(transpose((((((X|X) +transpose(shuffle((X|X) ) ,4) ) +transpose((X+(X+transpose(X,7) ) ) ,7) ) +transpose((X|X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) ,-5) +transpose((transpose(((transpose(X,-7) +transpose(transpose(step(transpose(step(X,12) ,-5) ,12) ,-5) ,7) ) |(transpose(X,-7) +transpose((arpeggio(echo(X,4,6) ) |((X+X) |transpose(X,-7) ) ) ,7) ) ) ,4) +transpose(shuffle(step(transpose(transpose(echo(X,4,6) ,4) ,-5) ,12) ) ,12) ) ,4) ) +transpose(transpose(((transpose(X,-5) +transpose((X+transpose(X,7) ) ,12) ) +transpose(X,7) ) ,-5) ,7) ) +transpose(shuffle((shuffle((transpose(((X+transpose(X,12) ) +((X|X) |step(X,12) ) ) ,4) |transpose(step((X+transpose((X+transpose(X,12) ) ,12) ) ,12) ,4) ) ) |step((((((X|X) +transpose(X,-5) ) +transpose(echo(X,4,6) ,4) ) +transpose((X|X) ,7) ) +transpose(X,-7) ) ,12) ) ) ,4) ) +transpose((((arpeggio(((X+X) +transpose(arpeggio(X) ,12) ) ) +transpose(echo(step(transpose(X,-7) ,12) ,4,6) ,4) ) +transpose(((step((X|X) ,12) +transpose(transpose(((X|X) +transpose(X,7) ) ,-5) ,4) ) +transpose(echo(echo((X|X) ,4,6) ,4,6) ,7) ) ,7) ) +(((step(X,12) +transpose((step(X,12) +step(X,12) ) ,12) ) +transpose(transpose(X,-7) ,-5) ) |transpose(transpose(shuffle((arpeggio(X) +transpose(X,4) ) ) ,-5) ,-7) ) ) ,7) ) +transpose(((((transpose(transpose(transpose(echo(X,4,6) ,4) ,4) ,-7) +transpose((transpose((X+transpose(X,12) ) ,4) |(transpose(transpose(X,-7) ,-7) |arpeggio((X+X) ) ) ) ,4) ) +transpose(((step(X,12) +X) |X) ,7) ) +transpose(transpose(echo(step((X|X) ,12) ,4,6) ,4) ,4) ) +transpose(step((((X+transpose(X,-5) ) +transpose(X,7) ) +transpose(((step(transpose(shuffle(X) ,4) ,12) +transpose(transpose(arpeggio(X) ,-5) ,4) ) +transpose(transpose(step(X,12) ,-7) ,7) ) ,12) ) ,12) ,7) ) ,12) ) ,12) ,7) ) ,12) random seed used was 62
EXPR = (shuffle(((((transpose(transpose(transpose(X,4) ,-5) ,4) +transpose(shuffle((((X+step(shuffle((transpose(X,4) +transpose(echo(X,4,6) ,12) ) ) ,12) ) +transpose(step(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,4) ) +transpose((transpose(((X+X) +transpose(X,4) ) ,-5) +transpose(arpeggio(transpose(X,-5) ) ,12) ) ,7) ) ) ,12) ) +transpose((transpose(transpose(((X|X) +transpose(X,4) ) ,-7) ,-5) +((shuffle(shuffle(X) ) +transpose(((transpose(transpose((X+X) ,-5) ,-5) +transpose(shuffle((X+transpose(echo(X,4,6) ,7) ) ) ,4) ) +transpose(((X|X) +transpose(transpose((X|X) ,-5) ,7) ) ,7) ) ,4) ) +transpose(transpose((X+arpeggio(echo(X,4,6) ) ) ,-7) ,7) ) ) ,4) ) +transpose(step(((X|X) +transpose((transpose(X,-5) |shuffle(X) ) ,12) ) ,12) ,7) ) +transpose(echo(arpeggio(((X+arpeggio((transpose(X,-5) +(X+transpose((X|X) ,7) ) ) ) ) +((step(X,12) +transpose(((transpose((X+X) ,-7) +transpose(shuffle(X) ,7) ) |step(((X|X) +(X|X) ) ,12) ) ,4) ) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose((echo(transpose(X,-7) ,4,6) |(X+X) ) ,7) ) ,7) ) ) ) ,4,6) ,7) ) ) |(echo(transpose(echo(transpose(transpose((((arpeggio(X) +transpose((X|X) ,12) ) +(((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((arpeggio(X) +transpose(transpose(X,4) ,12) ) ,7) ) ) +((((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) |X) |X) ) ,-5) ,-5) ,4,6) ,4) ,4,6) |shuffle(transpose((shuffle(transpose(echo(step(X,12) ,4,6) ,-7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose((X+(X+transpose(X,12) ) ) ,-5) ) ) ,7) ) ,4) ) ) ) random seed used was 0
EXPR = step((shuffle(transpose((((transpose(transpose((X|X) ,4) ,4) +transpose(((transpose(arpeggio(arpeggio(X) ) ,4) +transpose(transpose(((X+transpose(transpose(X,-5) ,12) ) +(transpose(X,-7) +step(X,12) ) ) ,-5) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,12) ) +transpose(transpose(transpose(step((((transpose(X,4) |(X+transpose(X,4) ) ) +arpeggio(echo(X,4,6) ) ) +transpose(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-7) ,12) ) ,12) ,4) ,-7) ,7) ) +transpose(shuffle(step(shuffle((transpose(step(X,12) ,4) |transpose(X,4) ) ) ,12) ) ,4) ) ,-5) ) +(echo(transpose(shuffle((((((((X+X) +transpose((echo(X,4,6) +transpose(step(X,12) ,12) ) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) +transpose(transpose(X,-5) ,12) ) +(X+(X+transpose(X,12) ) ) ) +transpose((transpose(echo(transpose(transpose(X,-7) ,-5) ,4,6) ,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(step(transpose((echo(transpose(X,-5) ,4,6) +transpose((transpose(X,-5) |transpose(X,-7) ) ,12) ) ,4) ,12) ,7) ) ) ,-7) ,4,6) |((transpose(((transpose(echo(X,4,6) ,-5) |((echo(transpose(X,4) ,4,6) +transpose((transpose(X,-5) +(X+X) ) ,4) ) +transpose(X,7) ) ) |(shuffle(((X+transpose(X,7) ) |(X+transpose(X,12) ) ) ) |arpeggio(echo(transpose(X,-5) ,4,6) ) ) ) ,4) +transpose(((step(transpose(((X+transpose(X,7) ) |(X+transpose(X,7) ) ) ,4) ,12) +transpose((((X|(X+transpose(X,12) ) ) +transpose(transpose((X+X) ,-5) ,12) ) +(transpose((X+X) ,-5) +transpose((X+transpose(X,7) ) ,12) ) ) ,4) ) +transpose((((((X|X) |transpose(X,-7) ) +transpose((arpeggio(transpose(X,-5) ) +(transpose(X,-7) +transpose(step(X,12) ,12) ) ) ,-7) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-7) ,4) ) +transpose(transpose(shuffle(transpose(X,4) ) ,-5) ,7) ) ,7) ) ,7) ) +shuffle(transpose(transpose(transpose((transpose(transpose(X,-5) ,-5) |(X+X) ) ,4) ,-7) ,-7) ) ) ) ) ,12) random seed used was 0
EXPR = (transpose((arpeggio(transpose(((transpose(step(X,12) ,4) +transpose(step(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,12) ,4) ) +transpose(((((X|X) +transpose(echo(X,4,6) ,7) ) |step(transpose(step(X,12) ,4) ,12) ) +transpose(step((X|X) ,12) ,12) ) ,7) ) ,-5) ) +step((step(((((((X+transpose(X,7) ) +X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,12) ) +transpose(transpose((((X+transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) |(X+transpose((X+X) ,12) ) ) ,-5) ,7) ) +echo((echo(((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) +transpose((((X+transpose(arpeggio(X) ,12) ) +transpose(step((X+transpose(X,7) ) ,12) ,4) ) +transpose((transpose(X,-5) +(X+X) ) ,7) ) ,12) ) ,4,6) ) |arpeggio(step(shuffle(shuffle(X) ) ,12) ) ) ,12) +transpose(transpose(transpose(echo(((arpeggio(X) +transpose(X,-5) ) +transpose((transpose(X,-7) +transpose(echo(X,4,6) ,7) ) ,4) ) ,4,6) ,4) ,-5) ,12) ) ,12) ) ,-5) +transpose((arpeggio(echo(echo(((transpose(X,-5) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4,6) ,4,6) ) +step((((transpose(echo(X,4,6) ,4) +shuffle((X+transpose(X,7) ) ) ) +step(step(X,12) ,12) ) +transpose(step((transpose(X,-7) +transpose(X,-7) ) ,12) ,12) ) ,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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