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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: | (((arpeggio((transpose(((transpose(arpeggio(transpose((arpeggio(transpose(X,-5) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,12) ) ,-5) ) ,4) |((echo(transpose(transpose(X,-7) ,-7) ,4,6) +(transpose(shuffle(echo(X,4,6) ) ,-5) +transpose((X+transpose(echo((X|X) ,4,6) ,7) ) ,7) ) ) |((((X|X) |step(X,12) ) +transpose((step(X,12) +shuffle(X) ) ,12) ) |transpose(shuffle(step(transpose(X,4) ,12) ) ,4) ) ) ) +transpose(((((X+X) +shuffle(X) ) +transpose(step(shuffle(step(transpose(X,-5) ,12) ) ,12) ,7) ) +transpose(transpose((((((step(X,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +transpose(((((X+transpose(X,7) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+X) +transpose((echo(X,4,6) |echo(X,4,6) ) ,12) ) ,7) ) |((transpose(X,-7) +transpose(((transpose(X,4) +transpose(X,-7) ) +((transpose(X,-7) +transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose((X|X) ,7) ) ) ,-7) ,12) ) ,12) ) ,-7) +arpeggio(transpose(step(transpose(transpose(step((arpeggio(X) |shuffle(X) ) ,12) ,-5) ,4) ,12) ,-5) ) ) ) +transpose(arpeggio(transpose(arpeggio(((transpose((transpose((step(X,12) |arpeggio((step(X,12) +transpose(X,12) ) ) ) ,-5) +((X+transpose((X+transpose(X,7) ) ,7) ) |(arpeggio(((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose(step(transpose(transpose(X,4) ,4) ,12) ,7) ) ) ) ,-7) +transpose((transpose(transpose(transpose(((echo(X,4,6) +transpose(X,4) ) +transpose((X|X) ,7) ) ,4) ,-5) ,-5) +((((transpose(shuffle(X) ,-5) +transpose(transpose(transpose(X,-7) ,-5) ,12) ) +transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose(echo(X,4,6) ,4) ,7) ) +transpose((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) ,12) ) ,4) ) +transpose((((transpose((X+transpose(X,7) ) ,4) +transpose(shuffle(X) ,4) ) +transpose((X+X) ,7) ) +transpose(transpose(X,-5) ,12) ) ,7) ) +((X+X) +transpose((X+transpose(X,12) ) ,-7) ) ) ) ,7) ) |arpeggio(echo(((arpeggio(transpose(X,4) ) +transpose(transpose(X,4) ,12) ) +transpose(transpose((step(X,12) +transpose(transpose(shuffle((X+transpose(X,7) ) ) ,-7) ,7) ) ,4) ,12) ) ,4,6) ) ) ) ,-5) ) ,12) ) +transpose((transpose(transpose((transpose((transpose(((arpeggio(X) +transpose(arpeggio(X) ,7) ) +(X|arpeggio(X) ) ) ,-5) +transpose(transpose(((echo(X,4,6) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,-5) ,12) ) ,-5) |((echo(transpose(X,-5) ,4,6) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose(((transpose((X+transpose(X,12) ) ,-7) +transpose(((X|X) +transpose(transpose(X,-7) ,7) ) ,7) ) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) ,7) ) ) ,4) ,-5) |((shuffle((transpose((X|transpose((((X|X) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,-7) ) ,-5) +step(transpose(((X|X) |transpose(transpose(X,4) ,4) ) ,-5) ,12) ) ) |arpeggio(X) ) |transpose(((transpose(transpose((X+transpose((echo(X,4,6) |(X|X) ) ,12) ) ,-7) ,4) |(shuffle(((shuffle(X) +shuffle(X) ) +transpose(transpose(((X+X) +transpose(X,7) ) ,4) ,7) ) ) +transpose((X+transpose(X,4) ) ,7) ) ) |transpose(transpose(((X+X) |(X+transpose(transpose(X,4) ,7) ) ) ,-7) ,4) ) ,-7) ) ) ,7) ) +((arpeggio(shuffle(((((transpose(transpose(shuffle(transpose(X,4) ) ,-7) ,-7) +transpose((((X+transpose(X,-5) ) +(echo(transpose(X,4) ,4,6) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ) +transpose((X|((((X|X) |X) +transpose((X+transpose(X,7) ) ,12) ) |(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,7) ) ,-5) ) +transpose(((transpose(((step(((X|X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) +transpose((((transpose((X|X) ,4) +(X+transpose(X,12) ) ) +transpose(arpeggio((X+X) ) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) +transpose(transpose(arpeggio(((transpose(X,-5) +transpose(shuffle(transpose(X,4) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ) ,4) ,4) ) +transpose(((echo(arpeggio(X) ,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((((((transpose(transpose((X+X) ,-5) ,4) +transpose((echo(transpose(X,4) ,4,6) |(arpeggio(X) +transpose(X,12) ) ) ,4) ) +transpose(shuffle(echo(shuffle(X) ,4,6) ) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(((X+X) +transpose(step(X,12) ,12) ) ) ,7) ) +transpose(transpose((transpose(X,4) +transpose(((((X+transpose(X,12) ) +transpose(X,7) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,4) ) +transpose(((X+X) +transpose(echo(X,4,6) ,12) ) ,7) ) ,7) ) ,-5) ,12) ) ,12) ) ,7) ) ,12) ) +transpose(transpose((((X+transpose(X,7) ) |((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose((X|X) ,7) ) ) +transpose(X,-7) ) ,4) ,4) ) +transpose(arpeggio(transpose((((arpeggio(echo((X+transpose(X,7) ) ,4,6) ) +transpose(arpeggio((X+transpose(transpose(X,-7) ,7) ) ) ,7) ) |echo(transpose((X+X) ,-7) ,4,6) ) +transpose(step(((X+transpose((step(X,12) +X) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ,12) ,12) ) ,-7) ) ,7) ) ) ) +step(((transpose(step(((X|transpose((X|X) ,-7) ) +transpose(transpose((echo(X,4,6) |(X+X) ) ,-5) ,12) ) ,12) ,4) |echo(transpose(step(step((X+transpose(X,7) ) ,12) ,12) ,-7) ,4,6) ) +transpose((transpose(transpose(shuffle(X) ,4) ,-5) +transpose((((((transpose(X,4) +transpose(transpose(X,-5) ,-5) ) +transpose(transpose((X+X) ,-7) ,7) ) +transpose(((echo(X,4,6) +transpose((X|X) ,12) ) |transpose(((X+transpose(X,12) ) +X) ,-7) ) ,4) ) +transpose(transpose((arpeggio(((echo(X,4,6) |step(X,12) ) |echo(X,4,6) ) ) |((((X+X) +transpose(X,-7) ) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(echo(arpeggio((X+transpose(X,7) ) ) ,4,6) ,7) ) ) ,-5) ,4) ) +transpose(transpose(transpose(arpeggio(transpose(((echo(X,4,6) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,4) ) ,-7) ,4) ,7) ) ,12) ) ,-5) ) ,12) ) |transpose((shuffle(transpose(((X+transpose(transpose(X,4) ,7) ) +transpose(X,7) ) ,-5) ) +(transpose(((transpose(((X+transpose(X,12) ) +(X+X) ) ,4) +transpose(((((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +(transpose(X,-5) +transpose(X,7) ) ) +((((X+X) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ) ,4) ) +transpose(transpose(((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(step((X+transpose((X+X) ,12) ) ,12) ,-5) ,12) ) ,4) ,7) ) ,-7) +((shuffle((arpeggio((((X|X) |X) |X) ) +((shuffle(step(X,12) ) +arpeggio((X+transpose((X+X) ,12) ) ) ) |transpose(X,-7) ) ) ) |(((X+transpose(transpose(transpose(X,-7) ,-5) ,4) ) +transpose((transpose(X,-5) |shuffle(X) ) ,7) ) +((X+transpose((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,7) ) |X) ,7) ) ,12) ) +(transpose((transpose(X,-5) +transpose(X,12) ) ,-5) +transpose(((X|X) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ) ) ) ) +(echo((transpose((X+X) ,4) +((transpose(transpose(X,4) ,-5) +transpose(transpose(X,4) ,7) ) |step((X+transpose(X,12) ) ,12) ) ) ,4,6) +arpeggio((echo((X+transpose(X,7) ) ,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ) ) ) ) ) ,-5) ) ) random seed used was 107460956
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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