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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 17 generations the expression "X" became this: | ((step(((transpose(((transpose(shuffle((transpose((shuffle((X|X) ) +transpose(X,12) ) ,-5) |transpose(transpose(shuffle(X) ,-5) ,-5) ) ) ,-5) +transpose((arpeggio(((transpose(X,4) |X) |(echo(step(shuffle(X) ,12) ,4,6) +transpose(arpeggio(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) ) ) +transpose(arpeggio(transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) ,12) ) ,12) ) |echo((step(shuffle(((arpeggio(X) |echo(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) ) |(transpose(X,4) |shuffle(X) ) ) ) ,12) |((step(shuffle(arpeggio(X) ) ,12) +transpose(echo(transpose(arpeggio(((transpose((X|X) ,-7) +transpose((shuffle(X) |shuffle(X) ) ,4) ) +transpose(((X+transpose(X,12) ) +X) ,7) ) ) ,4) ,4,6) ,4) ) +transpose(shuffle((shuffle(transpose(echo(X,4,6) ,-5) ) +(echo(X,4,6) +(shuffle(X) |X) ) ) ) ,7) ) ) ,4,6) ) ,-7) +transpose(((echo(((transpose(transpose(shuffle(shuffle((X+transpose(X,12) ) ) ) ,4) ,-7) +transpose((((shuffle(shuffle(shuffle(transpose((step(X,12) +transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-7) ) ) ) +transpose((((echo((X|X) ,4,6) +arpeggio(transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ,-7) ) ) |shuffle(shuffle((((X+X) +transpose((X|X) ,12) ) +(transpose(X,4) +transpose(echo(X,4,6) ,7) ) ) ) ) ) +transpose((echo(arpeggio((shuffle(X) +transpose(X,12) ) ) ,4,6) +transpose(echo((transpose((X+X) ,-5) +shuffle(transpose(X,-5) ) ) ,4,6) ,12) ) ,7) ) ,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) +step((step(transpose(((((X|X) |shuffle(X) ) +((X+transpose(X,12) ) +transpose((X+transpose(transpose(X,-7) ,12) ) ,7) ) ) +transpose(transpose(((X+transpose(X,-5) ) +transpose(step(shuffle(X) ,12) ,12) ) ,-5) ,12) ) ,-7) ,12) +transpose((step(shuffle(echo(X,4,6) ) ,12) +transpose(step((transpose(X,-5) |transpose(X,-5) ) ,12) ,-7) ) ,12) ) ,12) ) ,4) ) +transpose(transpose(transpose(((step(transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,12) +transpose(transpose(shuffle(shuffle(transpose(arpeggio(transpose(X,4) ) ,4) ) ) ,-5) ,7) ) +transpose(transpose(transpose((transpose((X+transpose(X,7) ) ,-5) +transpose(shuffle(X) ,12) ) ,4) ,4) ,-7) ) ,-5) ,4) ,7) ) ,4,6) +transpose(step(((echo(((transpose(transpose(step(X,12) ,4) ,-5) +transpose(step(echo(X,4,6) ,12) ,7) ) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(((transpose(X,-5) |X) |arpeggio(step(X,12) ) ) ,4) ) +transpose(shuffle(shuffle(X) ) ,7) ) ,12) ) ,4,6) +transpose(step(transpose(transpose(shuffle(transpose(X,-5) ) ,-7) ,-7) ,12) ,4) ) +transpose((echo((transpose(((transpose((arpeggio(X) +transpose((X+X) ,12) ) ,-7) +transpose(((shuffle(transpose(X,-7) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(arpeggio((arpeggio(X) +transpose(transpose(X,-7) ,12) ) ) ,7) ) ,4) +transpose(((step(shuffle(transpose(transpose(X,-7) ,-7) ) ,12) +transpose(((X+transpose(transpose(shuffle(transpose(X,-5) ) ,-7) ,4) ) +transpose((X+transpose((X+(X+transpose(X,12) ) ) ,12) ) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,4,6) |(transpose((transpose(transpose(X,-7) ,4) |(transpose(step(X,12) ,-5) +shuffle(X) ) ) ,-7) +transpose(transpose(step(((shuffle(transpose(X,-5) ) |X) +transpose(transpose(X,-5) ,4) ) ,12) ,-7) ,7) ) ) ,7) ) ,12) ,4) ) +transpose((shuffle(((((echo(echo(step(transpose(X,4) ,12) ,4,6) ,4,6) +transpose((((X+step(X,12) ) |(transpose(X,4) +transpose(transpose(X,-7) ,7) ) ) +transpose(shuffle(transpose(X,-7) ) ,12) ) ,4) ) +transpose(shuffle((transpose(transpose(X,4) ,-7) +transpose(transpose(transpose(transpose(X,-7) ,4) ,4) ,12) ) ) ,7) ) |((echo(((step(shuffle((transpose(X,-5) +(X+transpose(X,7) ) ) ) ,12) +transpose(transpose(((step((X+transpose(X,12) ) ,12) +transpose((transpose(X,-7) +transpose(shuffle(X) ,12) ) ,12) ) |(((X+transpose(X,4) ) +transpose((X+X) ,7) ) |X) ) ,-7) ,7) ) +transpose(arpeggio(transpose(((X|X) +transpose(transpose(transpose(X,-5) ,4) ,12) ) ,-5) ) ,12) ) ,4,6) +transpose(transpose(transpose(transpose(transpose(X,-7) ,4) ,4) ,-5) ,4) ) +transpose(transpose(arpeggio(shuffle(shuffle((step((X+transpose(X,7) ) ,12) +(shuffle(X) +transpose(X,12) ) ) ) ) ) ,-5) ,7) ) ) |((((transpose(((X|X) +arpeggio(X) ) ,-5) |transpose(echo(transpose((echo(X,4,6) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,4,6) ,-7) ) +(arpeggio((echo(transpose(X,-7) ,4,6) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ) +((arpeggio((transpose(X,4) |X) ) +transpose(arpeggio((transpose(X,-7) |X) ) ,4) ) +transpose(shuffle(X) ,7) ) ) ) |((shuffle((((X+X) +transpose(X,-5) ) +echo(transpose(X,4) ,4,6) ) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) +transpose((transpose(X,-5) +((((X+X) +transpose((transpose(X,-7) |transpose(X,-5) ) ,4) ) +transpose((((X|X) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) +transpose(transpose(((transpose(X,-5) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,-7) ,12) ) ) ,4) ) ) +transpose(echo((transpose(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ,4) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,4) ,7) ) ,4,6) ,12) ) ) ) +transpose(transpose(transpose(shuffle(X) ,4) ,-7) ,4) ) ,7) ) ,4) ) +transpose((transpose(((transpose(((transpose(echo(((echo((X+transpose(X,12) ) ,4,6) |X) +echo(((transpose(X,-7) +transpose(transpose(X,4) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) ) ,4,6) ,4) |transpose((transpose(transpose(arpeggio(X) ,4) ,-5) +arpeggio(transpose(transpose(X,-7) ,4) ) ) ,-7) ) +transpose((transpose((((X+X) +transpose(transpose(X,-7) ,12) ) +echo(X,4,6) ) ,-7) +transpose(transpose((transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,12) ) ,12) ) ,4) +transpose((transpose(((shuffle(X) +transpose((transpose(X,-7) +(X|X) ) ,12) ) +transpose(shuffle((((transpose(X,-5) +transpose((X+X) ,12) ) +transpose(shuffle(X) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) ) ,12) ) ,4) +transpose(transpose(transpose(transpose((transpose(X,-7) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,-7) ,-5) ,-5) ) ,4) ) +transpose(transpose(transpose(shuffle(transpose(shuffle(transpose(echo((X+X) ,4,6) ,-7) ) ,-7) ) ,4) ,4) ,7) ) ,4) +transpose(transpose(transpose(shuffle((transpose((transpose((((echo(transpose((X|X) ,4) ,4,6) +transpose(transpose(((X+transpose(X,7) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ,4) ,4) ) +transpose(echo((step(X,12) +transpose(X,12) ) ,4,6) ,7) ) +shuffle((step(X,12) +(X|X) ) ) ) ,-7) +transpose(step(((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) ,12) ,12) ) ,-7) |((transpose(((X|X) +transpose(transpose(X,4) ,12) ) ,4) +transpose(echo(transpose(transpose(shuffle(X) ,4) ,-5) ,4,6) ,4) ) +transpose((transpose(echo(shuffle(X) ,4,6) ,-7) |arpeggio(transpose(X,-5) ) ) ,7) ) ) ) ,-7) ,-5) ,12) ) ,7) ) ,12) +transpose(transpose(transpose(shuffle(transpose((shuffle(shuffle(shuffle(shuffle(X) ) ) ) +step(shuffle(arpeggio((X+shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ) ,12) ) ,-7) ) ,-5) ,-7) ,4) ) +transpose(transpose((echo(transpose(transpose((shuffle(shuffle(arpeggio(transpose(X,4) ) ) ) |transpose(((step(X,12) |echo(X,4,6) ) +((X+X) +shuffle(X) ) ) ,-7) ) ,-7) ,4) ,4,6) |transpose(transpose(shuffle(shuffle(transpose(echo(echo(X,4,6) ,4,6) ,-7) ) ) ,-7) ,-7) ) ,4) ,7) ) random seed used was 238957680
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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