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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((((echo(transpose(((shuffle(transpose((X+(((X+X) +transpose(X,4) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ) ) ,4) ) +transpose((transpose((X+transpose(X,7) ) ,-7) +step(X,12) ) ,4) ) +transpose((shuffle(transpose(echo(step(X,12) ,4,6) ,-7) ) |(step((X|(X|X) ) ,12) +transpose(((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose((echo(X,4,6) |X) ,7) ) ,7) ) ) ,7) ) ,4) ,4,6) +((step(step(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,12) ,12) |transpose(step(echo((X+X) ,4,6) ,12) ,-7) ) +transpose(transpose(arpeggio(echo(X,4,6) ) ,4) ,7) ) ) +transpose(transpose(echo(((echo(X,4,6) +transpose(transpose(((X+transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) ,-7) ,4) ) +transpose((X+transpose((X+(X+transpose(X,7) ) ) ,12) ) ,7) ) ,4,6) ,4) ,7) ) +(transpose((step(transpose(transpose(arpeggio(step((X|X) ,12) ) ,-5) ,4) ,12) +transpose((transpose(transpose(((X+X) |X) ,-7) ,-7) +transpose((step(X,12) +((((X|X) +transpose(X,12) ) +transpose((X|X) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ) ,12) ) ,4) ) ,-5) |(transpose(step((transpose(arpeggio(X) ,4) +transpose(step((X|X) ,12) ,4) ) ,12) ,-7) +transpose(echo((echo((transpose((X+transpose(X,12) ) ,-7) +transpose(shuffle((X+transpose(X,12) ) ) ,12) ) ,4,6) +((((transpose(transpose(X,4) ,-7) +transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,12) ) +transpose(((transpose(X,4) +transpose(transpose(arpeggio(X) ,4) ,4) ) +transpose(((X|X) +transpose(X,12) ) ,7) ) ,4) ) +transpose(((X+X) +transpose(X,4) ) ,7) ) +transpose(step(transpose(arpeggio(shuffle(X) ) ,-5) ,12) ,7) ) ) ,4,6) ,7) ) ) ) ,4) +transpose((step(transpose(transpose(((transpose(echo((X+X) ,4,6) ,4) +transpose(echo(transpose(X,4) ,4,6) ,12) ) +transpose((transpose(shuffle(X) ,4) |((X|X) +X) ) ,12) ) ,4) ,-7) ,12) |((transpose(echo(((step(echo(X,4,6) ,12) +((X|X) +arpeggio((X+transpose(X,7) ) ) ) ) +(((transpose(((X|X) +transpose(transpose(X,-7) ,12) ) ,-5) +(((X|X) +(X+X) ) |X) ) |((X+(X+transpose(X,12) ) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) ) |((transpose(((X+transpose((X+transpose(X,12) ) ,7) ) +((shuffle(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,-7) +transpose((transpose((X+transpose(X,7) ) ,4) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(echo(((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(echo(X,4,6) ,12) ) ,4,6) ,7) ) ) ) ,4,6) ,-7) +transpose((transpose(X,-5) |transpose((X+transpose(X,7) ) ,-5) ) ,4) ) +transpose(transpose(transpose(transpose((transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,4) +transpose((transpose(transpose(transpose(X,-5) ,4) ,4) |((X|X) +transpose(X,4) ) ) ,12) ) ,4) ,-5) ,4) ,7) ) ) ,4) ) +transpose((((((step((transpose((shuffle((X+transpose(X,7) ) ) +transpose((X+X) ,7) ) ,4) +transpose(transpose((transpose(X,-5) +transpose(X,7) ) ,-5) ,12) ) ,12) |echo(((transpose(X,-7) |X) |arpeggio(transpose(X,4) ) ) ,4,6) ) +(((transpose((transpose(transpose(X,4) ,-5) |(((arpeggio(((transpose(X,-5) +transpose(X,4) ) +transpose(X,7) ) ) +(((X+transpose((X|X) ,12) ) +transpose(X,4) ) +transpose((X|X) ,7) ) ) +transpose(transpose((X+transpose((X|X) ,7) ) ,4) ,12) ) +transpose(arpeggio(((X+X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ) ,12) ) ) ,-7) |transpose((transpose(X,-5) |transpose(X,4) ) ,4) ) +transpose(echo(transpose(((transpose((X|X) ,4) +transpose(transpose(transpose(transpose(X,-7) ,4) ,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) ,4,6) ,4) ) +transpose(transpose(transpose(shuffle(((X+transpose(transpose(X,4) ,12) ) +transpose(echo(X,4,6) ,4) ) ) ,-5) ,-5) ,7) ) ) +transpose(transpose(((shuffle(transpose(transpose(transpose(arpeggio(X) ,-7) ,-7) ,-7) ) +transpose((((transpose(((transpose((X+X) ,4) +step(X,12) ) +transpose(X,-7) ) ,4) |((X+X) +transpose(((echo((X|X) ,4,6) +arpeggio(X) ) +transpose(X,7) ) ,12) ) ) |((shuffle((X+transpose(X,7) ) ) |((step((X+transpose(X,12) ) ,12) +transpose(step(X,12) ,4) ) +transpose(((echo((X+transpose(X,12) ) ,4,6) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) ) +transpose((((X+X) +transpose(transpose(X,-7) ,12) ) +transpose((((transpose((X+transpose(X,12) ) ,4) +(transpose(X,-5) |X) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,12) ) ,7) ) ) +transpose(echo(transpose((((X|X) +transpose(X,-7) ) |shuffle(transpose(X,-7) ) ) ,-7) ,4,6) ,-7) ) ,4) ) +transpose(transpose(step(transpose(shuffle(transpose(X,-7) ) ,-7) ,12) ,-7) ,7) ) ,-5) ,12) ) +transpose(echo((step(transpose(arpeggio(((shuffle(X) +transpose(arpeggio(transpose(transpose(X,-5) ,-7) ) ,4) ) +transpose((X+transpose(transpose(X,-7) ,12) ) ,7) ) ) ,-5) ,12) +transpose((transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,4) ,4) +transpose(((transpose(X,4) |transpose(X,-7) ) +transpose(transpose(transpose(X,-7) ,-5) ,4) ) ,12) ) ,12) ) ,4,6) ,7) ) |transpose(echo((transpose(transpose(transpose((transpose(X,-5) |transpose(step(transpose(transpose(X,-5) ,-5) ,12) ,-7) ) ,4) ,-5) ,-5) +transpose(transpose((((shuffle(step(shuffle(X) ,12) ) |(transpose((X|X) ,-7) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-7) ,4) ) |transpose(transpose((arpeggio(shuffle(X) ) +transpose(transpose((arpeggio(X) +transpose(shuffle(X) ,7) ) ,4) ,7) ) ,-5) ,4) ) ,-5) ,12) ) ,4,6) ,-7) ) ,7) ) ,-7) +transpose(((transpose((transpose(step(transpose((X+X) ,-5) ,12) ,4) +((X+transpose(transpose(X,-5) ,12) ) +step(echo((X+transpose(X,12) ) ,4,6) ,12) ) ) ,4) +(((shuffle((transpose(echo(transpose(X,-5) ,4,6) ,-5) |((X+transpose(((X+transpose(shuffle(X) ,12) ) +transpose(step(X,12) ,12) ) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) ) ) +transpose(echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) +transpose(transpose((X+X) ,-5) ,4) ) ,4,6) ,7) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ,4) ) +transpose(step(((((X|(X|X) ) +transpose(transpose(X,4) ,7) ) +transpose((X+transpose((X+X) ,12) ) ,-5) ) +transpose((transpose(transpose(X,4) ,-5) +step(X,12) ) ,-7) ) ,12) ,7) ) ) +transpose((transpose(((X+transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) |(X+transpose(X,7) ) ) ,-7) +(transpose((transpose((X|(X+transpose(X,12) ) ) ,-7) |step((X+shuffle(X) ) ,12) ) ,-7) +shuffle(((transpose(X,-7) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) |transpose((X|X) ,-5) ) ) ) ) ,7) ) ,-7) ) random seed used was 241209255
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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