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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: | echo(transpose(((step(echo(((transpose(((shuffle((transpose(echo(shuffle(arpeggio(transpose(transpose(shuffle(X) ,-5) ,-7) ) ) ,4,6) ,-7) +transpose(echo((arpeggio(echo(X,4,6) ) |((transpose(step((X|step(X,12) ) ,12) ,-7) +transpose(echo((X+transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,4,6) ,7) ) ) +transpose(transpose((step(((shuffle(X) +transpose(X,-7) ) |((X+transpose(step(X,12) ,12) ) |(X+transpose(X,12) ) ) ) ,12) +transpose(arpeggio((((X+transpose(X,7) ) +transpose(step(X,12) ,7) ) +transpose(transpose(X,4) ,7) ) ) ,12) ) ,-7) ,4) ) +transpose(((echo(shuffle(transpose(X,4) ) ,4,6) +transpose(((((((X+transpose(X,4) ) +transpose(arpeggio(X) ,7) ) +(X+transpose(X,12) ) ) +transpose((X+transpose((X|X) ,7) ) ,12) ) +transpose(echo(arpeggio(X) ,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) ,12) ) +transpose(((transpose(transpose((X+transpose(X,12) ) ,-7) ,-7) +transpose(transpose(shuffle(echo(X,4,6) ) ,-7) ,7) ) +transpose(arpeggio(X) ,-7) ) ,7) ) ,7) ) ,-7) +transpose(echo(transpose((transpose(transpose(transpose(transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(arpeggio(shuffle(X) ) ,7) ) ,4) ,-7) ,4) ,-7) +transpose((step((step((X+transpose(X,12) ) ,12) |step(transpose(X,-5) ,12) ) ,12) +transpose(transpose(X,-7) ,4) ) ,7) ) ,4) ,4,6) ,4) ) +transpose(transpose(transpose((step(transpose(echo(((X+transpose(((X+transpose(X,12) ) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,4,6) ,-7) ,12) +arpeggio((transpose((((shuffle(X) +transpose(X,12) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((X+transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,-5) +transpose(echo(((X+transpose(X,12) ) +transpose((X+echo(transpose(X,4) ,4,6) ) ,7) ) ,4,6) ,12) ) ) ) ,-7) ,-5) ,7) ) ,4,6) ,12) +transpose(transpose(transpose((transpose(((transpose((transpose(echo(X,4,6) ,-5) +step(((X+transpose(X,7) ) +X) ,12) ) ,-5) +transpose((echo(transpose(arpeggio(shuffle(step(step(echo(X,4,6) ,12) ,12) ) ) ,-7) ,4,6) +transpose(step(shuffle(transpose(transpose(arpeggio(((transpose(X,-7) +transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) ) ,-7) ,4) ) ,12) ,12) ) ,4) ) +transpose((arpeggio((((echo(X,4,6) +transpose((X|((X+transpose(X,7) ) +transpose(step(X,12) ,7) ) ) ,4) ) +transpose(((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +(X+transpose((X+X) ,12) ) ) ,7) ) |(arpeggio((X+transpose(echo(X,4,6) ,12) ) ) +transpose(step(X,12) ,7) ) ) ) +(transpose(((arpeggio(X) +transpose(transpose(X,-5) ,12) ) +transpose((transpose(X,4) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,7) ) ,-7) +step(shuffle((arpeggio(X) +transpose(step(arpeggio(X) ,12) ,12) ) ) ,12) ) ) ,7) ) ,4) +transpose(shuffle(arpeggio((((transpose(X,-5) +transpose(transpose(transpose(X,4) ,4) ,7) ) +transpose((transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +echo(transpose(X,-7) ,4,6) ) ,4) ,-7) +transpose((transpose(echo(X,4,6) ,-7) +transpose(step((transpose(X,4) +transpose((X+transpose(X,12) ) ,7) ) ,12) ,12) ) ,12) ) ,7) ) +(arpeggio(((arpeggio((X+transpose(X,12) ) ) +transpose(X,12) ) +transpose(((transpose((X+transpose(X,7) ) ,-7) +transpose((transpose(X,-7) +transpose(X,7) ) ,4) ) +transpose(step((X+transpose(X,12) ) ,12) ,7) ) ,12) ) ) +transpose(transpose(echo(((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(X,12) ) +transpose((arpeggio((X+X) ) +(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) ,4,6) ,-5) ,12) ) ) ) ) ,7) ) ,-5) ,-7) ,4) ) +transpose(transpose(shuffle(((transpose(echo(((((echo(X,4,6) |step(X,12) ) +transpose((X|X) ,7) ) |X) +transpose(step(transpose((X+transpose(X,7) ) ,-7) ,12) ,12) ) ,4,6) ,-5) |transpose(echo(transpose(transpose((transpose(X,-5) +transpose(X,7) ) ,-7) ,-7) ,4,6) ,-5) ) +((step(echo((shuffle(((step((X+transpose((X+X) ,7) ) ,12) +transpose(step(X,12) ,12) ) +X) ) +transpose((((((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) |((X|X) +transpose(step(X,12) ,7) ) ) +transpose((transpose(X,-7) |(shuffle(X) |(((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ) ) ,4) ) +transpose(echo((X+transpose(arpeggio(X) ,7) ) ,4,6) ,7) ) ,7) ) ,4,6) ,12) +transpose((arpeggio((transpose((X+transpose(transpose(transpose(X,-7) ,4) ,12) ) ,4) +transpose(step(X,12) ,12) ) ) +transpose(arpeggio((transpose((step((echo(transpose(X,-7) ,4,6) +transpose(shuffle(X) ,7) ) ,12) +transpose(echo(shuffle(shuffle(X) ) ,4,6) ,7) ) ,-7) +transpose((((((transpose(X,-7) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) +shuffle((X+transpose(X,12) ) ) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) +transpose(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +X) ) ,7) ) ,7) ) ) ,7) ) ,7) ) +transpose(echo(transpose((shuffle(((transpose((((transpose(X,-7) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) |(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(transpose(X,-5) ,12) ) ) +transpose((shuffle(X) +transpose(X,7) ) ,12) ) ,4) +transpose(arpeggio(transpose(transpose(X,-7) ,-7) ) ,4) ) +transpose((transpose((step((X+transpose(X,12) ) ,12) +transpose(step((echo(X,4,6) +transpose((X+transpose(X,12) ) ,12) ) ,12) ,7) ) ,4) |echo(step(step(transpose(transpose(X,4) ,-5) ,12) ,12) ,4,6) ) ,7) ) ) +transpose(transpose(step(arpeggio(shuffle((((transpose((transpose(X,4) +transpose(transpose(X,4) ,12) ) ,4) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) |(step(((arpeggio(X) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) +(echo(X,4,6) +transpose(echo(X,4,6) ,7) ) ) ) ) ) ,12) ,-7) ,7) ) ,-7) ,4,6) ,7) ) ) ) ,-5) ,7) ) ,-7) ,4,6) random seed used was 9417275
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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