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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 18 generations the expression "X" became this: | ((echo(transpose(((((shuffle(((X+transpose(X,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +echo(X,4,6) ) ,-5) ) ) +transpose((((((transpose(arpeggio(transpose(X,-5) ) ,-5) +transpose((echo(transpose(X,-7) ,4,6) +transpose(((transpose(X,-7) +transpose((X+X) ,12) ) +transpose(shuffle(X) ,4) ) ,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |echo(X,4,6) ) ,4) ,4) ) +transpose((transpose(transpose(step(X,12) ,4) ,4) |shuffle(shuffle(transpose(X,4) ) ) ) ,7) ) +transpose(echo((transpose(transpose(X,-7) ,-5) |(transpose(shuffle((X+transpose(X,12) ) ) ,-7) |step(((((X+transpose(X,7) ) +(X+transpose(X,7) ) ) +transpose(step(step(X,12) ,12) ,7) ) +X) ,12) ) ) ,4,6) ,12) ) ,7) ) +transpose(((transpose(transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,4) ,-7) +transpose((((transpose(transpose(transpose(((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,-7) ,-7) ,-5) +transpose(((X|X) +X) ,4) ) +transpose(transpose((transpose(X,-5) +(transpose(X,-5) |transpose(X,-7) ) ) ,-7) ,7) ) +transpose(transpose(transpose(transpose(((shuffle(arpeggio(X) ) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,-5) ,-5) ,4) ,12) ) ,12) ) +(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |X) |transpose((transpose(transpose(X,-5) ,-7) +((X+X) +transpose(X,7) ) ) ,-7) ) ,4) +transpose(transpose(((X+transpose(X,12) ) +X) ,4) ,12) ) ) ,4) ) +transpose(transpose(step((((step(arpeggio(echo((X+transpose(X,7) ) ,4,6) ) ,12) +transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose(transpose((transpose(transpose(X,-5) ,4) +(X|X) ) ,4) ,7) ) |transpose(((transpose((X|X) ,-5) +transpose(echo(transpose((X+X) ,4) ,4,6) ,4) ) +transpose((transpose(X,4) +X) ,7) ) ,-5) ) ,12) ,-7) ,7) ) |(transpose(transpose((step(X,12) +transpose(transpose(X,-5) ,-5) ) ,-5) ,-5) |step(transpose((echo((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) +(X+transpose(X,12) ) ) +transpose((((X+X) +X) |((transpose(X,-7) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4) ) +transpose(transpose((transpose(X,4) |X) ,4) ,7) ) ,4,6) |(((transpose(echo(X,4,6) ,4) +transpose((transpose(X,4) +transpose(X,12) ) ,12) ) |transpose(echo(X,4,6) ,4) ) +transpose(((transpose(echo(X,4,6) ,4) +transpose((X+transpose(X,12) ) ,12) ) |(echo(X,4,6) |transpose(X,4) ) ) ,12) ) ) ,-5) ,12) ) ) ,-5) ,4,6) +transpose((transpose(((echo(transpose((transpose(transpose(X,-7) ,-5) +echo((X|X) ,4,6) ) ,-7) ,4,6) +transpose(transpose((((X|X) |step(transpose((transpose(X,-5) +transpose((X+transpose(X,12) ) ,7) ) ,-7) ,12) ) |echo(((((X+transpose(X,7) ) +echo(X,4,6) ) +(X+X) ) |((X+transpose(X,12) ) +X) ) ,4,6) ) ,-7) ,12) ) +(((shuffle(X) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose(arpeggio(X) ,7) ) +echo((X|X) ,4,6) ) ) ,-5) |(((echo(transpose(arpeggio(transpose(X,-7) ) ,-5) ,4,6) |echo(transpose((transpose(X,-7) +(transpose(X,-7) +transpose(arpeggio(X) ,7) ) ) ,-7) ,4,6) ) +((arpeggio(transpose(X,-7) ) +transpose(transpose(X,-7) ,12) ) +transpose((transpose(X,-5) +transpose((X|transpose(shuffle(X) ,4) ) ,7) ) ,7) ) ) +(transpose(arpeggio(transpose((X+transpose(X,12) ) ,-7) ) ,-5) |(((transpose((transpose(transpose((X+transpose(X,7) ) ,-7) ,-5) +transpose((step((((X+X) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,12) |arpeggio(((X+transpose(X,12) ) +transpose((X+transpose(X,12) ) ,7) ) ) ) ,7) ) ,-7) |(transpose((transpose(arpeggio((X+transpose(X,12) ) ) ,4) |(transpose(X,4) +transpose((X|X) ,12) ) ) ,4) +transpose(transpose(((transpose(X,4) +transpose(X,12) ) +transpose(transpose(shuffle(shuffle(X) ) ,-7) ,12) ) ,-5) ,12) ) ) +transpose(shuffle((((shuffle((X+X) ) +((transpose(X,-5) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ) |shuffle(transpose(X,-7) ) ) |shuffle(transpose(X,-5) ) ) ) ,12) ) +transpose(transpose(((((((X+transpose(X,7) ) +X) +transpose(transpose(shuffle(X) ,4) ,12) ) |echo((echo(X,4,6) +((shuffle(X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4,6) ) +transpose((transpose(echo((X+(X+transpose(X,12) ) ) ,4,6) ,-5) +transpose(shuffle((transpose(transpose(X,4) ,4) +(X+X) ) ) ,7) ) ,4) ) +transpose((X|shuffle(shuffle(X) ) ) ,7) ) ,-5) ,12) ) ) ) ) ,-7) ) +transpose(step(transpose(((step(transpose(echo(step(transpose(transpose(transpose(transpose(arpeggio(X) ,4) ,4) ,-7) ,4) ,12) ,4,6) ,-7) ,12) +transpose(((((((shuffle(echo(transpose(X,-7) ,4,6) ) +transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4) +transpose(echo(X,4,6) ,12) ) ,12) ) +(echo((step(X,12) +transpose(echo(X,4,6) ,12) ) ,4,6) +transpose((((X+X) |X) +transpose(transpose(X,-7) ,7) ) ,12) ) ) +transpose(transpose(((((transpose(X,-5) |((arpeggio(X) +transpose(X,7) ) |echo(X,4,6) ) ) +transpose((transpose((X|shuffle(X) ) ,-7) |transpose(X,4) ) ,12) ) +transpose((((X|X) +(arpeggio(X) +X) ) +(shuffle(arpeggio(X) ) +transpose((transpose(X,4) |((shuffle(X) +transpose((X|X) ,4) ) +transpose(X,7) ) ) ,7) ) ) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) |(X+transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,7) ) ) ,7) ) ,-5) ,12) ) +transpose(((((transpose(step(transpose((X|X) ,-5) ,12) ,4) |transpose(shuffle(transpose(X,4) ) ,4) ) +transpose(transpose((step(X,12) +X) ,4) ,12) ) +transpose((transpose((X+transpose(((((X+X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +(X|X) ) ,7) ) ,-7) +transpose(transpose(shuffle((X|X) ) ,4) ,-5) ) ,4) ) +transpose(transpose(transpose((shuffle((arpeggio(transpose(X,-7) ) +(X+X) ) ) +transpose((transpose(arpeggio(X) ,-5) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,12) ) ,-7) ,4) ,7) ) ,12) ) |step(step(((shuffle(shuffle(X) ) +transpose(arpeggio(echo(X,4,6) ) ,4) ) +transpose((transpose((X+X) ,-7) +transpose((transpose(X,-7) +transpose((X+X) ,7) ) ,7) ) ,7) ) ,12) ,12) ) |((transpose((echo((transpose(X,-5) |X) ,4,6) +((X+X) +transpose(X,12) ) ) ,4) +transpose(transpose(arpeggio(transpose(X,-7) ) ,-5) ,4) ) +echo((transpose(X,-5) +transpose(((X+transpose((X|X) ,7) ) |transpose((X+transpose(X,12) ) ,-5) ) ,7) ) ,4,6) ) ) ,4) ) +transpose(step((X|(transpose(arpeggio((echo(X,4,6) +transpose(X,7) ) ) ,4) +echo(((X+transpose(X,12) ) +echo(transpose(X,4) ,4,6) ) ,4,6) ) ) ,12) ,7) ) ,-7) ,12) ,7) ) random seed used was 172839556
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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