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