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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 19 generations the expression "X" became this: | transpose(shuffle((((echo(((transpose(((transpose(((transpose((X+transpose(X,7) ) ,4) +X) +(((echo(transpose(step(X,12) ,-7) ,4,6) +transpose(X,4) ) +transpose(arpeggio((X+transpose(echo(X,4,6) ,12) ) ) ,4) ) +transpose(transpose(echo(((X+X) +transpose(echo(X,4,6) ,7) ) ,4,6) ,-5) ,7) ) ) ,4) +transpose(transpose(((transpose(transpose(arpeggio(X) ,4) ,-7) +arpeggio((X|X) ) ) +transpose(shuffle(((((((X+transpose(X,4) ) +transpose(X,7) ) +shuffle(X) ) +transpose(X,-5) ) +transpose(step(transpose(transpose(X,-5) ,-7) ,12) ,4) ) +transpose((transpose(X,-5) |(X+X) ) ,7) ) ) ,12) ) ,-5) ,7) ) |(transpose(echo(X,4,6) ,-7) +transpose(transpose((transpose(((X+X) +transpose((X|X) ,7) ) ,4) +transpose((echo(X,4,6) |(X|transpose(X,-5) ) ) ,-7) ) ,-5) ,12) ) ) ,4) +transpose((((shuffle(step(transpose(X,-7) ,12) ) +transpose((transpose(shuffle(X) ,-5) |step(step(X,12) ,12) ) ,12) ) +transpose(transpose((transpose((((X+X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,-7) +transpose(transpose(X,4) ,12) ) ,-7) ,12) ) |(transpose(transpose((((echo(X,4,6) +transpose(step((X|transpose(X,4) ) ,12) ,7) ) +transpose(transpose(transpose(X,4) ,-7) ,12) ) +transpose(transpose(step(transpose(X,4) ,12) ,4) ,12) ) ,-7) ,-5) +transpose(arpeggio(arpeggio(transpose(echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ,-5) ) ) ,12) ) ) ,4) ) +transpose(echo((((transpose(arpeggio(X) ,-5) +transpose(shuffle((transpose(X,4) +X) ) ,7) ) +transpose((transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,-7) ) ,4) +transpose(transpose(transpose((X+X) ,4) ,-7) ,12) ) ,7) ) |((transpose(X,-7) |echo(transpose(((transpose((X|X) ,4) +transpose((arpeggio(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) |(echo(X,4,6) |X) ) ,-7) ,4,6) ) |shuffle((step((X+(X+transpose(X,12) ) ) ,12) +transpose(((transpose(X,-5) +transpose(X,12) ) +transpose(X,-7) ) ,12) ) ) ) ) ,4,6) ,7) ) ,4,6) +transpose(shuffle(((echo(transpose((transpose(((X|X) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) +transpose(transpose((X+(X+X) ) ,4) ,12) ) ,-7) ,4,6) +transpose(transpose(arpeggio(transpose(X,-5) ) ,4) ,-7) ) |arpeggio(echo(transpose(shuffle((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(X,7) ) ) ,4) ,4,6) ) ) ) ,4) ) +transpose(transpose(echo(((((step((X+transpose(arpeggio(transpose(X,-5) ) ,12) ) ,12) +(transpose((echo(X,4,6) +transpose((step(X,12) |X) ,12) ) ,-5) +transpose(step(X,12) ,4) ) ) +transpose((((echo(echo((X+X) ,4,6) ,4,6) +(X|X) ) +transpose((step(echo(X,4,6) ,12) +arpeggio(X) ) ,12) ) +(shuffle(shuffle((transpose(X,-7) +transpose((X+transpose(X,7) ) ,7) ) ) ) +(((X|shuffle(X) ) |transpose(X,-5) ) +transpose(arpeggio(echo(transpose(X,-5) ,4,6) ) ,12) ) ) ) ,4) ) +transpose(transpose(transpose((transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ,4) |echo(step(transpose(transpose(X,-7) ,-5) ,12) ,4,6) ) ,-5) ,4) ,7) ) +transpose((transpose(shuffle(shuffle((transpose(X,4) +(X+X) ) ) ) ,-5) +transpose(((shuffle(echo(arpeggio(X) ,4,6) ) +((shuffle(X) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) |transpose((transpose((X+transpose(X,12) ) ,4) |(shuffle(echo(X,4,6) ) +(X+transpose(X,12) ) ) ) ,-5) ) ,12) ) ,-5) ) ,4,6) ,-5) ,7) ) +transpose(((transpose(arpeggio(((((transpose(echo(((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,4,6) ,-5) |(shuffle(transpose(X,-7) ) +transpose(X,-5) ) ) +transpose((transpose((X+transpose(X,7) ) ,4) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,-7) ,12) ) ,4) ) +transpose(transpose((shuffle(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) +transpose((X+X) ,12) ) ,4) ,7) ) |(transpose((transpose((transpose(X,-5) |(arpeggio(X) +transpose((X+transpose(X,12) ) ,12) ) ) ,-7) +transpose(echo(((X+transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ,12) ) ,4) +(((shuffle(shuffle((X|X) ) ) +transpose(transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) ,-7) ,4) ) +transpose(transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +arpeggio(X) ) |(X+transpose(X,12) ) ) ,4) ,4) ,7) ) +shuffle(transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) ) ) ) ) ,4) +transpose(arpeggio((transpose(echo(step(arpeggio(transpose(X,-7) ) ,12) ,4,6) ,-5) +transpose(echo(transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) |X) +(X+X) ) |(((((X|X) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ) +transpose(transpose(transpose(X,4) ,4) ,12) ) ,4) ,4,6) ,12) ) ) ,4) ) +transpose(((((transpose(transpose(((((transpose(X,4) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose((X+X) ,7) ) ,-5) ,-5) +transpose(((shuffle(X) |(step(X,12) +step(X,12) ) ) +transpose(arpeggio(X) ,-5) ) ,4) ) +transpose(echo(transpose(transpose(X,-7) ,-7) ,4,6) ,7) ) |transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose((((X|(X|X) ) +transpose(transpose((X|X) ,-5) ,4) ) +transpose((X+X) ,7) ) ,4) ,4) ) +transpose(((X|X) |(((X+transpose(X,12) ) +transpose(X,-7) ) |step(X,12) ) ) ,7) ) +transpose(arpeggio((shuffle(transpose(transpose(X,4) ,4) ) |arpeggio(X) ) ) ,12) ) ,4) ) |(arpeggio(shuffle((shuffle((transpose(step(X,12) ,-5) +transpose((echo(X,4,6) +transpose((X+X) ,4) ) ,12) ) ) +transpose(transpose(transpose(transpose(X,-7) ,-7) ,-7) ,-5) ) ) ) +transpose(transpose(step(arpeggio(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,12) ,-5) ,4) ) ) ,7) ) ,7) ) ) ,-7) random seed used was 204682973
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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