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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 13 generations the expression "X" became this: | (((arpeggio(((transpose(transpose((transpose(transpose(X,-7) ,-5) +transpose(transpose((X+X) ,-7) ,-5) ) ,-5) ,4) +transpose(arpeggio(shuffle(arpeggio((transpose(step(X,12) ,-5) +((X+echo(X,4,6) ) |(transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) ) ) ) ) ) ,7) ) +transpose(transpose(transpose(X,4) ,4) ,-5) ) ) |transpose(((transpose(((((((X+shuffle(transpose(X,-5) ) ) +transpose(transpose(step(X,12) ,4) ,7) ) +transpose(shuffle((X|X) ) ,4) ) +transpose(transpose(((X+X) |X) ,4) ,7) ) +transpose(step(echo(X,4,6) ,12) ,12) ) |transpose(arpeggio((transpose(X,-7) +transpose(X,7) ) ) ,-7) ) ,-7) +transpose(shuffle(((((((X|X) +transpose(((X|X) +transpose(echo(X,4,6) ,12) ) ,4) ) +transpose((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) |((X+transpose(X,7) ) |step(X,12) ) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(X) ) ,-7) ,7) ) +transpose(transpose(transpose(X,4) ,4) ,-7) ) ) ,4) ) +transpose(transpose(transpose(((((((X+X) +transpose((step(X,12) +arpeggio(X) ) ,7) ) |(X+X) ) +transpose(X,12) ) +transpose(((shuffle(X) |step((X+X) ,12) ) +transpose(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-7) ,12) ) ,7) ) |arpeggio((transpose(((X+transpose(X,12) ) +transpose(transpose(X,-5) ,12) ) ,-5) +transpose(transpose((X|X) ,-7) ,7) ) ) ) ,-7) ,-5) ,7) ) ,-5) ) +transpose(shuffle((((transpose(((transpose(transpose(X,-7) ,-5) |transpose((transpose(X,-5) |transpose(X,-5) ) ,-5) ) |transpose(step((X|X) ,12) ,4) ) ,-7) |(transpose(transpose((X+X) ,-7) ,-5) +shuffle((step(X,12) +(echo(echo(X,4,6) ,4,6) +transpose(transpose(transpose(X,4) ,4) ,12) ) ) ) ) ) +(step(((transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) +transpose(((((X|X) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) +(step(X,12) +transpose(X,4) ) ) ,12) ) +transpose(transpose(transpose((transpose(X,-5) +transpose(X,4) ) ,-5) ,4) ,12) ) ,12) +transpose(transpose(shuffle(((((echo(X,4,6) +transpose(transpose(X,-7) ,7) ) +transpose((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose((transpose(X,4) |echo(X,4,6) ) ,7) ) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) ) ,-5) ,7) ) ) |(transpose(shuffle(transpose(transpose(step(echo(transpose(X,-7) ,4,6) ,12) ,-5) ,-5) ) ,-5) |arpeggio(((((transpose(X,-5) +X) +((X+transpose(X,7) ) +transpose(arpeggio(X) ,7) ) ) |transpose(X,-5) ) +transpose(echo(transpose((X+transpose(X,7) ) ,-5) ,4,6) ,-7) ) ) ) ) ) ,4) ) +transpose(transpose(((((echo(step(X,12) ,4,6) +(transpose(step(X,12) ,-5) +((X+(transpose(X,-5) +transpose(X,4) ) ) +transpose(X,-7) ) ) ) +transpose(((arpeggio(arpeggio((X+X) ) ) +transpose(arpeggio(shuffle(step(X,12) ) ) ,-7) ) +transpose((transpose(step(shuffle(transpose((X|X) ,-5) ) ,12) ,4) +transpose(transpose(transpose((X|X) ,4) ,-5) ,12) ) ,12) ) ,4) ) +transpose((echo(transpose(echo(transpose(X,4) ,4,6) ,-7) ,4,6) |shuffle(shuffle((transpose((transpose(X,-7) +(X+transpose(X,7) ) ) ,-7) +(((transpose(X,4) +X) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose(transpose(X,4) ,7) ) ) ) ) ) ,7) ) +((transpose(echo((((echo((X|(X|X) ) ,4,6) +transpose(transpose((transpose(X,-7) +transpose(X,-5) ) ,-5) ,12) ) +transpose((shuffle((arpeggio(X) +transpose(transpose(X,-5) ,7) ) ) +transpose((transpose(X,-5) +(X+X) ) ,7) ) ,4) ) +transpose(((step(X,12) |(X|X) ) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,4,6) ,-5) +transpose((arpeggio((X|X) ) +transpose(shuffle(X) ,7) ) ,-5) ) +transpose(((step(transpose((((X|X) +transpose(X,4) ) +transpose((X|X) ,7) ) ,4) ,12) |step((X+(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) +transpose(((X|X) |(X+transpose(X,12) ) ) ,12) ) ) ,12) ) +(shuffle(((X|X) |((X+transpose(X,12) ) +transpose(X,-7) ) ) ) |(((transpose(X,-5) +X) +(arpeggio(X) +transpose((X|X) ,12) ) ) +transpose(shuffle(shuffle((echo((X+transpose(X,12) ) ,4,6) +X) ) ) ,7) ) ) ) ,7) ) ) ,4) ,7) ) random seed used was 24389
EXPR = (((shuffle(((transpose(X,4) +transpose(X,7) ) +transpose(transpose(((shuffle(arpeggio(X) ) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,-5) ,-7) ) ) |(shuffle(shuffle((X+transpose(X,-5) ) ) ) +transpose((echo(transpose(X,4) ,4,6) +(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) +transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,12) ,7) ) ) ,7) ) ) +echo(((step(transpose(X,-5) ,12) +transpose(shuffle(X) ,7) ) +(transpose((X+transpose(X,4) ) ,-5) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,7) ) ) ,4,6) ) +transpose(((arpeggio(arpeggio(((step(transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,4) ,12) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +X) +transpose(X,7) ) ,7) ) |(((echo((X|X) ,4,6) +transpose(((X+transpose(X,7) ) +transpose(X,-5) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +(transpose(((X+transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) +transpose(transpose((echo(transpose(X,4) ,4,6) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,4) ,7) ) ) ) ) ) +transpose(transpose(echo(arpeggio(shuffle(transpose(echo(X,4,6) ,-7) ) ) ,4,6) ,4) ,4) ) +transpose(step(transpose(echo(echo((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +X) ,4,6) ,4,6) ,-5) ,12) ,7) ) ,-7) ) random seed used was 0
EXPR = transpose(((transpose((transpose((transpose(X,-5) +transpose(X,-7) ) ,-7) +((((X+transpose(X,7) ) +transpose((X|X) ,7) ) +transpose((X+(X|X) ) ,4) ) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ) ,-5) +transpose(transpose(shuffle((X+(X|X) ) ) ,-5) ,7) ) +transpose((transpose((((transpose(echo((X+transpose(X,7) ) ,4,6) ,-5) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,-5) ,7) ) |shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) ) ) ,-7) +transpose(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ,7) ) ,12) ) ,-7) random seed used was 0
EXPR = transpose(transpose(step(((arpeggio(echo(((X+transpose(X,7) ) +transpose(transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,4) ,7) ) ,4,6) ) +transpose((transpose((transpose(((echo(transpose(X,-5) ,4,6) +transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ,-7) +shuffle((transpose(X,-7) |(X+transpose(X,12) ) ) ) ) ,4) +(echo((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(X,-5) ,7) ) ,4,6) +transpose(transpose(step(transpose(step(transpose(X,-5) ,12) ,-5) ,12) ,-5) ,7) ) ) ,12) ) +transpose((arpeggio((arpeggio(X) +transpose(transpose(transpose(transpose(X,4) ,-7) ,-7) ,7) ) ) +((((X|X) |((X+transpose(X,7) ) +(X|X) ) ) +transpose(transpose(X,-7) ,-5) ) +transpose(transpose(transpose(X,-7) ,-5) ,-5) ) ) ,12) ) ,12) ,-5) ,-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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