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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: | (transpose(((transpose((transpose(transpose(step(transpose(((((((X|X) +transpose(X,12) ) |(X+transpose(X,7) ) ) |(((X|X) +transpose(transpose((step(X,12) +transpose((X+transpose(X,7) ) ,12) ) ,-5) ,4) ) +transpose(((X|X) |shuffle(X) ) ,7) ) ) +transpose((transpose(transpose(X,-5) ,4) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) +(X|X) ) ,-5) ,7) ) ,-7) ,12) ,4) ,-5) |((step(echo((transpose(((X+X) +transpose(X,12) ) ,4) |(((((X+transpose(X,4) ) +transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) |((X+X) |X) ) +transpose(shuffle(X) ,-5) ) ) ,4,6) ,12) +(((shuffle(X) +transpose(transpose(X,4) ,7) ) +step(X,12) ) |step((transpose(X,-7) |(X+X) ) ,12) ) ) +(transpose(transpose(transpose(((((arpeggio(X) +(transpose((X|X) ,4) |arpeggio(transpose(X,4) ) ) ) +transpose(((step(echo(X,4,6) ,12) |X) +transpose(arpeggio(shuffle(X) ) ,7) ) ,4) ) +transpose((transpose(X,-5) |transpose(X,4) ) ,7) ) +transpose(((((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose((X|transpose(X,-5) ) ,7) ) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) ,12) ) ,-7) ,4) ,-7) +transpose(transpose((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) +shuffle(shuffle((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ) ) ) ,4) ,7) ) ) ) ,4) +transpose(transpose(((transpose((X+transpose(transpose(echo(transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,-7) ,4,6) ,4) ,7) ) ,-7) +transpose((((((transpose(X,-7) +transpose(((transpose(X,-5) +transpose(transpose((step(X,12) +transpose(X,12) ) ,4) ,4) ) +transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose(X,-5) ) ,7) ) ,7) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) +transpose(transpose(transpose((arpeggio(X) +transpose(step(X,12) ,7) ) ,-7) ,-7) ,4) ) +transpose((echo(echo(X,4,6) ,4,6) +((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) +transpose((((transpose(transpose(shuffle(X) ,-5) ,4) +transpose(((transpose(echo(X,4,6) ,4) +transpose(X,7) ) +((X+X) +echo(X,4,6) ) ) ,4) ) +transpose(((((X|X) +X) |arpeggio(X) ) +transpose(transpose(step(X,12) ,-5) ,12) ) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) ) ,7) ) ,12) ) +transpose(arpeggio(((transpose((((X+transpose(transpose((X|X) ,4) ,12) ) |((((X|X) +transpose((X+X) ,4) ) +transpose(((X+transpose(X,7) ) +X) ,7) ) |shuffle(transpose(X,-7) ) ) ) +transpose(transpose((echo(transpose(X,-7) ,4,6) |((X|X) +X) ) ,-5) ,7) ) ,4) +transpose((((((((echo(X,4,6) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(X,7) ) +X) +transpose(echo(X,4,6) ,12) ) +step(((X|X) +transpose(X,12) ) ,12) ) +transpose(step(((((X|X) |transpose(transpose(X,4) ,-7) ) +transpose(X,12) ) |((transpose(transpose(X,4) ,4) +transpose(echo(transpose(step(X,12) ,4) ,4,6) ,4) ) +transpose(shuffle(step((X|X) ,12) ) ,7) ) ) ,12) ,12) ) ,12) ) +transpose(((((transpose(X,-7) +transpose(transpose(shuffle(((X+X) +transpose(echo(X,4,6) ,12) ) ) ,4) ,7) ) +transpose(arpeggio(transpose(X,-7) ) ,7) ) +transpose((step((transpose(X,4) |transpose(X,-7) ) ,12) +(((X+transpose((X+X) ,7) ) +transpose(((X|X) +transpose(echo(X,4,6) ,-7) ) ,12) ) +transpose(transpose((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,12) ) ) ,4) ) +transpose((transpose((((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) +transpose(step(((X|X) |X) ,12) ,12) ) ,-5) +transpose((((X+transpose(X,-7) ) +transpose((transpose(X,4) +transpose(transpose(X,4) ,12) ) ,12) ) +transpose(step((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) ,12) ,-5) ) ,7) ) ,7) ) ,4) ) ) ,12) ) ,-7) ,4) ) +transpose(transpose(transpose(transpose(transpose((((transpose(X,-7) +transpose(X,-5) ) +(transpose(X,4) |(X+transpose(X,7) ) ) ) +transpose(transpose(X,-7) ,12) ) ,-7) ,4) ,4) ,4) ,4) ) ,4) +transpose(((((((transpose(transpose(X,-7) ,-5) |(((X+transpose(X,7) ) +transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X|X) ,7) ) ,7) ) |echo((((X|transpose(X,-7) ) +transpose(transpose(X,-7) ,4) ) +transpose(echo((X+X) ,4,6) ,7) ) ,4,6) ) ) +transpose(transpose(((X+transpose(((X+transpose(X,12) ) +(X+transpose(X,7) ) ) ,12) ) |arpeggio(transpose(transpose(X,-7) ,-7) ) ) ,-5) ,-7) ) |(shuffle((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ) |(shuffle(((step(X,12) |(X|X) ) +transpose(step(transpose(X,-5) ,12) ,7) ) ) +transpose(((transpose(transpose((X+transpose(X,7) ) ,-7) ,-7) |((((X+transpose(X,4) ) +transpose(X,7) ) |X) |(X+transpose(X,7) ) ) ) +transpose(step(transpose((X|X) ,-5) ,12) ,7) ) ,12) ) ) ) +transpose(((((transpose((X+transpose(X,-7) ) ,4) |transpose((shuffle(X) +X) ,-5) ) +transpose((transpose((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) +transpose(X,-5) ) ,12) ) +((((((X|X) |((X+X) +transpose((X|X) ,7) ) ) +(((X+transpose(X,12) ) +(X+transpose(X,12) ) ) +arpeggio(X) ) ) +transpose(transpose((((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) ,4) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) +shuffle((X+transpose(X,12) ) ) ) ) +transpose(step((echo(transpose(transpose((X+X) ,-5) ,4) ,4,6) +transpose((transpose(X,-7) +transpose((transpose(X,4) +step((X+transpose(X,12) ) ,12) ) ,12) ) ,7) ) ,12) ,12) ) ,4) ) |(transpose(echo(((step(X,12) +transpose((X+transpose(step(X,12) ,7) ) ,12) ) +transpose((transpose(transpose(X,-7) ,4) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) ,12) ) ,4,6) ,-7) |(((transpose(transpose(((transpose(transpose(transpose(X,-7) ,-5) ,-7) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) ,4) ) +transpose(((X+X) +(X|X) ) ,7) ) ,-5) ,-7) +transpose((transpose(transpose(transpose((X|(X+X) ) ,4) ,-7) ,-7) +transpose((transpose(((X+X) +echo(X,4,6) ) ,4) +transpose((step(X,12) +transpose(X,7) ) ,12) ) ,12) ) ,4) ) +transpose(arpeggio(step(transpose(((transpose((X+transpose(X,12) ) ,-5) +transpose(X,12) ) +transpose((X+transpose((X|X) ,12) ) ,12) ) ,4) ,12) ) ,12) ) |transpose(echo(((transpose(transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(shuffle(X) ,12) ) ,4) ,4) +transpose(transpose(step((step(X,12) |X) ,12) ,4) ,-7) ) |shuffle(shuffle(step(shuffle(X) ,12) ) ) ) ,4,6) ,-5) ) ) ) +transpose(step(step(transpose(((step((step(echo(transpose(transpose(X,4) ,-5) ,4,6) ,12) +transpose(transpose((step(X,12) +transpose(((X+transpose(X,12) ) |step(X,12) ) ,7) ) ,4) ,12) ) ,12) +transpose(transpose((arpeggio(transpose((X+X) ,-7) ) +transpose(step(X,12) ,4) ) ,4) ,4) ) +transpose((((transpose(((transpose(transpose(X,4) ,-5) |transpose(X,-7) ) +(X+transpose(X,12) ) ) ,-7) |transpose((((X+X) +transpose(transpose(X,-5) ,7) ) +transpose(((((X+X) +X) +transpose(((X+transpose(X,7) ) |(X+transpose(X,12) ) ) ,4) ) +transpose((transpose(X,4) |(X+transpose(X,7) ) ) ,7) ) ,12) ) ,4) ) +transpose((transpose(step(transpose(echo(X,4,6) ,4) ,12) ,-5) +transpose((transpose(transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,-7) ,-7) |(shuffle(((X+transpose(X,7) ) |X) ) +transpose(echo(X,4,6) ,7) ) ) ,12) ) ,4) ) +transpose((transpose(transpose(transpose(X,-5) ,4) ,-5) +transpose(transpose((X|X) ,-7) ,-7) ) ,7) ) ,7) ) ,4) ,12) ,12) ,12) ) ,12) ) random seed used was 33075332
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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