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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(echo(((transpose(arpeggio(transpose((step((shuffle((X|X) ) +transpose(transpose((X+X) ,4) ,12) ) ,12) +transpose(transpose((((transpose(((X+transpose(X,12) ) |X) ,-5) +((transpose((X+X) ,-5) +transpose(transpose((X+transpose(X,7) ) ,-5) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ) +transpose((echo(transpose((X+transpose(X,7) ) ,4) ,4,6) +transpose(shuffle(transpose(X,4) ) ,-5) ) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,-5) ,12) ) ,-5) ) ,-5) +transpose(((((transpose(transpose((((transpose(transpose(((X+transpose(X,12) ) |X) ,-7) ,-7) +transpose((transpose(X,4) +transpose(X,12) ) ,4) ) +transpose(transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) ,4) ,7) ) +transpose(shuffle((X|transpose(X,4) ) ) ,7) ) ,4) ,4) +transpose((((transpose(((X|X) +transpose(X,7) ) ,-7) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,4) ,7) ) +transpose(transpose(((((transpose(X,4) +transpose(transpose(X,4) ,-5) ) +transpose(transpose(arpeggio((X|X) ) ,-5) ,7) ) +transpose(transpose((shuffle(X) +(X|X) ) ,4) ,4) ) +transpose(echo(echo((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,4,6) ,7) ) ,4) ,4) ) +transpose(transpose(echo((X+transpose(step(((X+transpose(X,7) ) |(X|X) ) ,12) ,12) ) ,4,6) ,4) ,7) ) ,12) ) +transpose(transpose(((transpose(((X+transpose(X,12) ) |(X|X) ) ,-5) +(arpeggio((((X|X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ) +transpose(X,12) ) ) |transpose((arpeggio((X|X) ) +transpose((X+(transpose(X,-7) |(X+X) ) ) ,7) ) ,4) ) ,-5) ,4) ) +transpose(echo(transpose(((transpose(echo(((X+transpose(X,12) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,4) +transpose((transpose(echo((transpose(X,-5) +transpose((X+X) ,7) ) ,4,6) ,-7) +transpose((transpose(X,4) +((X+X) +X) ) ,-5) ) ,4) ) +transpose(shuffle((transpose((X+transpose(X,12) ) ,4) |(step(transpose(X,-7) ,12) |transpose(transpose(X,-5) ,-5) ) ) ) ,7) ) ,-5) ,4,6) ,7) ) +((step(((transpose(transpose(transpose(transpose(shuffle(X) ,-5) ,-5) ,-5) ,4) +transpose(echo(transpose(transpose(X,-7) ,-5) ,4,6) ,7) ) +echo(echo((arpeggio(shuffle(echo(X,4,6) ) ) +transpose((arpeggio(X) +transpose(transpose(shuffle(X) ,4) ,7) ) ,7) ) ,4,6) ,4,6) ) ,12) |echo((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,-5) +((transpose(((transpose(X,4) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,-5) +transpose((transpose(X,-5) |transpose(X,-7) ) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(X,12) ) +X) ,7) ) ) ,4,6) ) |transpose(transpose(transpose(transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((echo(X,4,6) +(X|X) ) ,12) ) ,4,6) ,-5) ,-5) ,-5) ,4) ) ) ,4) ) +transpose(arpeggio(transpose(((transpose((echo((X+transpose(X,7) ) ,4,6) +step((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,4) +transpose(((transpose(X,4) +transpose(X,12) ) +transpose((X+transpose(X,12) ) ,12) ) ,-5) ) |(transpose(transpose(transpose(shuffle(echo(X,4,6) ) ,-7) ,4) ,-5) +((transpose(shuffle(X) ,4) +step(X,12) ) +transpose((transpose(arpeggio(arpeggio(transpose(X,-5) ) ) ,-5) |(X+transpose(X,7) ) ) ,7) ) ) ) ,-5) ) ,7) ) ,4,6) ,-5) +transpose(transpose((((transpose(transpose((echo(transpose(arpeggio((step(((((X+X) |transpose(X,-7) ) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,12) |((X+X) |transpose(X,-5) ) ) ) ,4) ,4,6) +transpose(arpeggio(transpose(transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(X,7) ) ,-5) ,-5) ,4) ) ,12) ) ,-5) ,4) +transpose(((arpeggio((echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) ,4,6) +transpose(transpose((transpose(X,-7) +transpose(shuffle((X+transpose(X,12) ) ) ,12) ) ,4) ,7) ) ) +transpose(echo(transpose(transpose((transpose(X,-7) +transpose(X,-5) ) ,4) ,4) ,4,6) ,4) ) +transpose(((transpose(transpose(((step((X|X) ,12) +transpose(transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ,-5) |transpose((transpose(transpose(echo((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ,4,6) ,4) ,-5) +transpose((((((transpose(X,4) +transpose(X,12) ) |(((X+transpose(X,4) ) +transpose(X,7) ) |X) ) +transpose(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) +transpose((step((X|X) ,12) |((transpose(X,-5) |X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ) ,12) ) ,4) ) +transpose(step((((shuffle((X|X) ) +transpose((transpose(X,-5) +X) ,12) ) +(X+transpose((transpose(X,-5) +transpose(echo(X,4,6) ,7) ) ,7) ) ) |step(((arpeggio((transpose(X,-7) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ) +transpose(shuffle(step(transpose(transpose(X,-7) ,-5) ,12) ) ,7) ) +(((transpose((X|X) ,-5) +(X|X) ) +transpose((((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) +X) ,4) ) +transpose((transpose(shuffle(X) ,4) +transpose((X+transpose(X,7) ) ,4) ) ,7) ) ) ,12) ) ,12) ,12) ) ,7) ) ,7) ) +arpeggio((transpose((step(transpose(transpose(step(transpose(X,-5) ,12) ,-7) ,-7) ,12) +((shuffle(step(X,12) ) +transpose(arpeggio(X) ,7) ) +transpose((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,7) ) ) ,-7) |arpeggio(shuffle(transpose(transpose(echo(((echo(X,4,6) +transpose(shuffle(transpose(X,4) ) ,4) ) +transpose((X|X) ,7) ) ,4,6) ,-7) ,-7) ) ) ) ) ) +transpose(transpose((((echo(transpose((echo(X,4,6) +transpose(transpose(transpose(((X+X) +((X|X) +transpose((X+transpose(X,7) ) ,12) ) ) ,-5) ,-5) ,12) ) ,-5) ,4,6) |(transpose((shuffle(X) +X) ,4) +transpose(transpose(arpeggio((transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(echo(X,4,6) ,7) ) ,4) +transpose(arpeggio(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |X) ) ,12) ) ) ,-5) ,7) ) ) +transpose((transpose(((((shuffle(X) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose((X|X) ,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ,4) |(transpose(((echo(X,4,6) +transpose(X,12) ) |X) ,-7) |transpose(transpose(shuffle((X+X) ) ,-5) ,-5) ) ) ,-7) ) +transpose(transpose(transpose(transpose(transpose(transpose(transpose(X,-5) ,4) ,-7) ,-5) ,-5) ,-5) ,7) ) ,-5) ,7) ) ,4) ,12) ) |transpose(transpose((transpose(step(transpose(transpose(shuffle(X) ,-5) ,-5) ,12) ,-7) +transpose(transpose((transpose(transpose((X+X) ,-7) ,4) +transpose((shuffle(echo((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ) |(step(arpeggio(X) ,12) +transpose((X+(X+X) ) ,7) ) ) ,7) ) ,4) ,12) ) ,-7) ,-5) ) random seed used was 204735939
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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