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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: | ((transpose((((((transpose(shuffle((transpose(step(((X+transpose(X,12) ) +transpose(X,12) ) ,12) ,4) +(((step(X,12) +transpose(transpose(X,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(((echo(X,4,6) +transpose((transpose(X,4) +transpose(arpeggio(X) ,12) ) ,7) ) +transpose(step((X+transpose(transpose(X,4) ,12) ) ,12) ,12) ) ,12) ) ) ) ,-7) +transpose(transpose((((((((echo(X,4,6) +transpose(transpose((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-7) ,4) ) +transpose(transpose(shuffle((X+X) ) ,-5) ,7) ) +transpose(echo((X|X) ,4,6) ,4) ) +(transpose(echo((transpose((X+transpose(X,7) ) ,-5) +transpose(X,-7) ) ,4,6) ,-5) +transpose(arpeggio(shuffle(X) ) ,7) ) ) +transpose(((step(shuffle((X+transpose(X,12) ) ) ,12) +(step(transpose((X+transpose(X,12) ) ,-5) ,12) +transpose(X,-5) ) ) +transpose(shuffle(echo(transpose(transpose(X,4) ,-7) ,4,6) ) ,12) ) ,7) ) +transpose(step(shuffle(((echo((transpose(X,4) |X) ,4,6) +transpose(transpose(arpeggio(transpose(X,-5) ) ,-7) ,12) ) |(shuffle(transpose(X,4) ) +transpose(echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) ,7) ) ) ) ,12) ,4) ) +transpose(arpeggio(transpose((echo(X,4,6) +transpose(transpose((X|transpose(X,4) ) ,-7) ,7) ) ,-5) ) ,7) ) ,4) ,4) ) +transpose(transpose(transpose((echo((((((echo(X,4,6) +transpose(X,7) ) +transpose(transpose(X,-5) ,-7) ) +transpose(step((X+shuffle(X) ) ,12) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) +transpose(shuffle(step(transpose(X,-5) ,12) ) ,12) ) ,4,6) +transpose(step(transpose(shuffle(transpose(echo(X,4,6) ,4) ) ,4) ,12) ,12) ) ,4) ,4) ,7) ) +transpose(arpeggio((transpose(((transpose(transpose((transpose(shuffle(X) ,-5) +transpose((transpose(X,-7) |X) ,12) ) ,-7) ,-7) +transpose(transpose(transpose(shuffle(echo(X,4,6) ) ,4) ,-7) ,4) ) +transpose((step((transpose(X,-5) +transpose(X,7) ) ,12) +transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) ) ,7) ) ,4) +transpose(((shuffle(transpose(((((shuffle(echo(X,4,6) ) +transpose(transpose(shuffle(X) ,4) ,7) ) +transpose(((((X+transpose(X,7) ) +transpose(X,-7) ) +transpose(shuffle(step(X,12) ) ,7) ) |echo(X,4,6) ) ,7) ) +transpose((((transpose(transpose(X,4) ,-7) +(arpeggio(X) +transpose(transpose(X,4) ,7) ) ) +transpose((arpeggio(X) |(arpeggio(transpose(X,4) ) +transpose(transpose(X,-7) ,4) ) ) ,4) ) +transpose(arpeggio(transpose((transpose(X,-7) +X) ,-7) ) ,7) ) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,-7) ) +transpose(transpose(transpose(arpeggio(transpose(transpose((X+transpose(transpose(X,-7) ,7) ) ,-5) ,-5) ) ,4) ,4) ,4) ) +transpose(((((transpose((X+transpose(((transpose(X,4) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,4) +transpose(transpose((transpose(arpeggio(X) ,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,7) ) +transpose(((transpose(step(X,12) ,-7) |(shuffle(X) +step(transpose(X,4) ,12) ) ) +transpose((shuffle(X) |X) ,7) ) ,4) ) +transpose(transpose(((transpose((X+transpose(X,7) ) ,-7) +transpose((transpose(X,4) +X) ,4) ) +transpose((transpose(X,4) +transpose(X,12) ) ,7) ) ,4) ,7) ) +transpose((shuffle(transpose(transpose((((X+transpose(X,4) ) +transpose((X+X) ,7) ) +transpose(arpeggio(echo(transpose(X,4) ,4,6) ) ,7) ) ,-7) ,-7) ) +transpose(transpose((((arpeggio(shuffle(X) ) +transpose(transpose(X,-5) ,12) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((transpose(((X+transpose(X,12) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,4) +transpose(echo(((transpose((X+transpose(X,12) ) ,-7) +transpose(transpose(X,4) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4,6) ,12) ) ,7) ) ,4) ,7) ) ,12) ) ,7) ) ,-7) ) ) ,12) ) +transpose((transpose(echo((shuffle(echo((transpose(transpose((X+transpose(X,7) ) ,4) ,-5) +transpose(step(transpose(transpose(X,-5) ,4) ,12) ,7) ) ,4,6) ) +transpose((shuffle(arpeggio(transpose((X+transpose(arpeggio(X) ,12) ) ,4) ) ) +transpose(step(transpose(shuffle(arpeggio(X) ) ,4) ,12) ,7) ) ,7) ) ,4,6) ,4) +transpose(transpose(transpose(transpose((arpeggio(transpose(arpeggio(X) ,-5) ) +transpose(((transpose((transpose(transpose(X,4) ,-7) +transpose(transpose(X,-5) ,-5) ) ,-5) +transpose(step(transpose(transpose(X,-7) ,-5) ,12) ,4) ) +transpose(transpose((transpose(X,4) |transpose((X+X) ,-5) ) ,-7) ,7) ) ,12) ) ,-7) ,4) ,4) ,7) ) ,4) ) +transpose(echo(step(shuffle(((transpose((((((X+transpose(transpose(X,4) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(((X+transpose(X,7) ) |(X|(X+transpose(X,12) ) ) ) ,4) ) +transpose(transpose((transpose(X,4) +transpose(X,7) ) ,-7) ,7) ) +transpose(transpose(transpose(X,-5) ,4) ,12) ) ,-7) +transpose((step(transpose(transpose(transpose((echo(X,4,6) +transpose(X,7) ) ,-7) ,-5) ,-7) ,12) |(transpose((transpose(shuffle(X) ,4) |transpose(transpose(X,4) ,-5) ) ,-7) |(arpeggio(step(X,12) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ) ) ,12) ) +transpose(transpose(arpeggio(transpose(transpose(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-7) ,4) ) ,4) ,7) ) ) ,12) ,4,6) ,7) ) ,-5) +transpose(step(transpose(echo((((shuffle(transpose(((echo(X,4,6) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ,-7) ) +transpose(transpose((transpose(shuffle((((echo(X,4,6) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) +transpose(step((X+X) ,12) ,7) ) ) ,4) |step(step(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose((X+X) ,7) ) ,4) ,12) ,12) ) ,-7) ,4) ) +transpose(step(step(transpose(echo(shuffle((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,-7) ,12) ,12) ,7) ) +transpose(shuffle((((transpose(((transpose((X+transpose(transpose(X,-5) ,7) ) ,4) +transpose(((X|transpose(X,-7) ) +transpose(step(X,12) ,12) ) ,4) ) +transpose(((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ,7) ) ,4) +transpose(((echo((transpose(X,4) +transpose(transpose(X,-5) ,7) ) ,4,6) +(((step(X,12) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ) +transpose(transpose(shuffle(transpose(transpose(X,-7) ,-5) ) ,4) ,12) ) ,12) ) +transpose((X+transpose(X,7) ) ,-7) ) +transpose(transpose(transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,-5) ,-7) ) ) ,7) ) ,4,6) ,-5) ,12) ,4) ) +transpose(transpose(shuffle(transpose(shuffle((shuffle(((echo(arpeggio((transpose(((X+transpose(X,7) ) +(X+transpose((X+X) ,7) ) ) ,4) +transpose(((transpose((X+transpose(X,12) ) ,4) +transpose((shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ,7) ) ,12) ) ) ,4,6) +transpose(step(transpose(transpose(echo(X,4,6) ,4) ,4) ,12) ,7) ) +transpose(transpose(arpeggio((echo(((X|X) +transpose(X,12) ) ,4,6) +transpose(((X+transpose(X,7) ) |((transpose(X,-7) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) ,7) ) ) ,-5) ,12) ) ) +transpose(echo(arpeggio(echo(transpose(X,-5) ,4,6) ) ,4,6) ,12) ) ) ,-7) ) ,4) ,7) ) random seed used was 118890740
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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