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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((((transpose((((((shuffle(transpose(arpeggio(step((transpose(X,-7) +transpose(transpose(X,4) ,4) ) ,12) ) ,-7) ) +transpose(transpose(((X+transpose(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,7) ) +(transpose(transpose(X,-5) ,-7) +(X+((X|X) +transpose(shuffle(X) ,12) ) ) ) ) ,-7) ,7) ) +transpose(((transpose(((transpose(transpose((arpeggio(X) +transpose(transpose(X,-7) ,7) ) ,-7) ,4) +transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose((step(transpose(X,4) ,12) +transpose(transpose(X,-7) ,7) ) ,7) ) ,4) +transpose((step((shuffle((X+X) ) |echo(X,4,6) ) ,12) +transpose(((((transpose((X|X) ,-7) |transpose((X|X) ,-5) ) +transpose(transpose(X,4) ,4) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) |(((X+transpose(transpose(X,-5) ,4) ) +transpose((((echo(X,4,6) +transpose((echo(X,4,6) |X) ,12) ) +transpose(((transpose(X,-7) |X) |((X+transpose(X,7) ) +transpose(shuffle(X) ,12) ) ) ,4) ) +transpose(transpose((X|transpose(X,4) ) ,-7) ,7) ) ,4) ) +transpose(step(arpeggio(X) ,12) ,7) ) ) ,7) ) ,4) ) +transpose(transpose((transpose(echo(transpose((X|X) ,-5) ,4,6) ,4) +transpose(((X+transpose(X,7) ) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,7) ) ,7) ) ,4) ,7) ) ,4) ) +transpose((transpose((X+transpose(arpeggio(transpose(X,-5) ) ,12) ) ,-5) +(transpose((transpose((X+X) ,4) +transpose(((transpose(transpose(X,-7) ,-7) |arpeggio(X) ) |transpose((X|X) ,4) ) ,12) ) ,-5) +transpose(((transpose(arpeggio(((X|X) +transpose(X,7) ) ) ,-5) +transpose(transpose(echo(transpose(X,4) ,4,6) ,4) ,7) ) +transpose(transpose((((X+X) +X) +transpose((X|X) ,4) ) ,-7) ,7) ) ,12) ) ) ,7) ) +(transpose((transpose(transpose((((X|X) +transpose(X,12) ) +transpose((X|echo(X,4,6) ) ,12) ) ,-5) ,-7) +step(((X|(transpose(X,-5) +transpose(transpose(X,-7) ,7) ) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-5) ,12) ) ,12) ) ,4) +transpose(((((step(step(X,12) ,12) |X) +transpose(echo(transpose(X,4) ,4,6) ,7) ) +transpose(transpose(X,4) ,-5) ) |(transpose(shuffle(X) ,4) +(X+transpose(echo(X,4,6) ,4) ) ) ) ,-7) ) ) +transpose(transpose((arpeggio((X+transpose(X,12) ) ) |step(X,12) ) ,4) ,-5) ) ,-5) +transpose(transpose(transpose(arpeggio(transpose((transpose(arpeggio(shuffle((((X|X) |(X|X) ) +transpose(transpose(step(X,12) ,4) ,12) ) ) ) ,4) +echo((X+transpose(X,12) ) ,4,6) ) ,4) ) ,-7) ,4) ,4) ) +transpose(((shuffle((echo(arpeggio((shuffle(arpeggio((((X+X) +transpose(X,4) ) +transpose((X|X) ,7) ) ) ) +transpose((step(transpose(step(X,12) ,-5) ,12) |transpose(X,4) ) ,-7) ) ) ,4,6) +shuffle((echo((step(X,12) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,-7) ,12) ) ,4,6) +transpose((((transpose((X|transpose((X+X) ,-7) ) ,4) +transpose(step(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) +transpose((((transpose((X+X) ,-5) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((X|X) ,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +echo(echo(transpose(X,-5) ,4,6) ,4,6) ) ,-7) ) ,12) ) ) ) ) +transpose(arpeggio(transpose((((((X+X) |(shuffle(X) +transpose(X,-5) ) ) |(arpeggio(X) |shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) +transpose(transpose((X|X) ,4) ,7) ) |echo((((step(transpose((X|X) ,4) ,12) +transpose(((transpose(X,-7) +transpose((X|X) ,12) ) +(arpeggio(X) |arpeggio(X) ) ) ,4) ) +transpose(shuffle(arpeggio(X) ) ,7) ) +transpose(transpose(((transpose(X,4) |X) +transpose((X+transpose(X,7) ) ,12) ) ,4) ,12) ) ,4,6) ) ,-5) ) ,4) ) +transpose((echo(transpose((((((shuffle(X) +transpose(transpose((X+X) ,-5) ,12) ) +transpose(arpeggio(transpose(X,-7) ) ,12) ) +transpose(transpose(X,-7) ,-7) ) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose((X+X) ,7) ) ,7) ) +arpeggio((shuffle((transpose(transpose(X,-5) ,-7) +transpose(X,12) ) ) |(transpose((transpose(X,-5) +transpose(arpeggio(X) ,12) ) ,4) +transpose(shuffle(X) ,7) ) ) ) ) ,-7) ,4,6) +transpose(echo((((step(transpose(step(transpose(shuffle(X) ,4) ,12) ,-7) ,12) +transpose((step(X,12) +(((transpose(X,-7) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose(transpose(X,4) ,4) ,12) ) ) ,4) ) +transpose(transpose(((X+transpose(X,12) ) +transpose(((X+X) +transpose(echo(X,4,6) ,12) ) ,12) ) ,4) ,7) ) +transpose((transpose((((X+transpose(X,12) ) |arpeggio(X) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,-5) +transpose((echo(((transpose(X,-5) +transpose((X+transpose(X,7) ) ,12) ) |(X|X) ) ,4,6) |transpose((arpeggio(step(X,12) ) +transpose(X,4) ) ,-5) ) ,7) ) ,12) ) ,4,6) ,7) ) ,7) ) ,7) ) +transpose(transpose(transpose(step(shuffle((arpeggio(X) +transpose(((((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(((X+X) |echo(X,4,6) ) ,4) ,12) ) ,7) ) ) ,12) ,4) ,-7) ,12) ) ,-5) +shuffle((shuffle(transpose((transpose(echo((shuffle(transpose(arpeggio((X+X) ) ,4) ) +transpose((transpose(echo(step(transpose(X,4) ,12) ,4,6) ,4) |step((transpose(X,-5) +transpose(transpose(X,4) ,7) ) ,12) ) ,12) ) ,4,6) ,-7) +transpose(transpose(transpose(((transpose((X|X) ,4) |(((X|X) +transpose(transpose((X+transpose(transpose(X,-5) ,7) ) ,-7) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) ) +(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(((X|X) +transpose(shuffle(X) ,7) ) ,4) ) ) ,4) ,4) ,12) ) ,4) ) +echo(transpose(transpose((echo(arpeggio(transpose((X+(X+X) ) ,-7) ) ,4,6) |transpose(((X+transpose(X,7) ) +transpose(((X+X) |echo(X,4,6) ) ,7) ) ,-7) ) ,4) ,-7) ,4,6) ) ) ) ,-7) 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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