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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: | (arpeggio(transpose(transpose(step(step(((((transpose((((step(X,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +transpose((echo(transpose(X,-7) ,4,6) +X) ,12) ) ,-7) +transpose((((X+transpose(X,12) ) |arpeggio(transpose(X,4) ) ) +transpose(((X+transpose(X,7) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,12) ) ,7) ) +transpose(transpose((transpose((X+transpose(step(X,12) ,12) ) ,4) |(((X+transpose(transpose(X,4) ,7) ) +transpose(transpose(transpose(transpose(X,4) ,-7) ,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,-7) ,7) ) +transpose((((shuffle(transpose(transpose(X,-7) ,4) ) +transpose(transpose((((transpose(X,4) +step(X,12) ) +shuffle((step(X,12) +arpeggio(X) ) ) ) +transpose(shuffle(arpeggio((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ) ,7) ) ,-7) ,4) ) +transpose(((transpose((X+transpose(X,7) ) ,-7) +(arpeggio(transpose((X+transpose(X,12) ) ,-5) ) +transpose(step((X+X) ,12) ,4) ) ) |(((X+transpose(X,7) ) +transpose(echo(shuffle(X) ,4,6) ,12) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) ) ,7) ) +transpose(step((((transpose(transpose(X,-7) ,-5) +arpeggio(X) ) +transpose(shuffle((X|X) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ,7) ) ,4) ) +transpose((transpose((((shuffle(X) +transpose(arpeggio(X) ,7) ) +(((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) ,-5) |transpose(transpose(transpose(arpeggio(((X+transpose(echo(X,4,6) ,12) ) |step(transpose(X,-7) ,12) ) ) ,-7) ,-7) ,4) ) ,7) ) ,12) ,12) ,4) ,-5) ) +echo((step(echo(transpose((((((arpeggio(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,7) ) ) +transpose(echo(shuffle(X) ,4,6) ,12) ) +transpose((arpeggio(echo(transpose(X,-5) ,4,6) ) +transpose((((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,-7) ) +transpose(echo(X,4,6) ,7) ) ,12) ) ,12) ) +transpose((transpose(((((transpose(X,4) +transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,12) ) +transpose(((echo(X,4,6) +transpose(arpeggio(X) ,12) ) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(echo(X,4,6) ,7) ) ,12) ) ,4) ) +transpose((X+transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,-7) ) ,7) ) |echo(transpose(((X|X) +transpose(step(X,12) ,7) ) ,-7) ,4,6) ) ,-7) +transpose((((echo(echo(X,4,6) ,4,6) +step((arpeggio(transpose(X,-5) ) |arpeggio((X+X) ) ) ,12) ) +transpose(shuffle(transpose((X|X) ,-7) ) ,4) ) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ,7) ) ,4) ) +transpose(((step(shuffle(echo(step(transpose(shuffle(X) ,-7) ,12) ,4,6) ) ,12) +transpose(shuffle(shuffle(X) ) ,7) ) +((((((X+transpose(X,7) ) +shuffle(arpeggio(X) ) ) +transpose(((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ,12) ) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose(echo((transpose((X+transpose(X,7) ) ,4) +(transpose(X,-5) +transpose(X,7) ) ) ,4,6) ,7) ) |step((X+transpose(X,12) ) ,12) ) ) ,7) ) +((arpeggio((transpose(X,-7) +transpose(X,12) ) ) +transpose((transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,-5) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,12) ) +(((((((X+transpose(shuffle(X) ,4) ) +transpose(transpose(echo(X,4,6) ,4) ,7) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) +transpose(transpose(arpeggio(transpose(X,-7) ) ,-5) ,7) ) +transpose((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(((echo((X+X) ,4,6) +((X+transpose(X,12) ) +X) ) +transpose(((X+X) +transpose(echo(X,4,6) ,7) ) ,12) ) ,12) ) ,12) ) +((arpeggio(step(echo(transpose(X,-7) ,4,6) ,12) ) +transpose(echo((transpose((X|arpeggio(X) ) ,-7) +transpose(transpose((X+transpose(arpeggio(X) ,12) ) ,-5) ,12) ) ,4,6) ,4) ) +transpose(arpeggio(echo((X+transpose(X,12) ) ,4,6) ) ,7) ) ) +(shuffle(transpose(((X|X) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,-7) ) +transpose((shuffle(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-7) ) |shuffle(step(echo(X,4,6) ,12) ) ) ,12) ) ) ) ) ,-7) ,4,6) ,12) |(((transpose((arpeggio((((X+transpose(X,7) ) +shuffle((X+transpose(X,7) ) ) ) |step(transpose(X,-7) ,12) ) ) +transpose(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) ,-5) +transpose(shuffle(step(transpose(transpose(step((arpeggio((X|transpose(X,-7) ) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) ,12) ,4) ,4) ,12) ) ,12) ) +transpose(arpeggio(transpose((step(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,12) |((((X+transpose(X,4) ) +transpose(X,7) ) |echo(X,4,6) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,-7) ) ,7) ) +transpose(shuffle(((transpose(((X+((X+transpose(X,12) ) +X) ) +transpose((X+transpose(X,12) ) ,12) ) ,-7) +transpose(shuffle((((arpeggio(echo(shuffle(((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ) ,4,6) ) +transpose((transpose((X+transpose(transpose(X,-7) ,7) ) ,-5) |((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) ,-5) ,12) ) ) ,12) ) +transpose((((echo(arpeggio(X) ,4,6) |step(echo((X+transpose(X,12) ) ,4,6) ,12) ) |transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4) ) +((X+transpose((shuffle(X) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) +transpose((transpose((X|X) ,-7) +transpose(((transpose(X,-7) +transpose(step(X,12) ,4) ) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,7) ) ,7) ) ) ,7) ) |arpeggio(echo(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) ) ) ) ,12) ) +transpose(((arpeggio(step(((shuffle((((X+(X+transpose(X,12) ) ) +transpose(transpose(X,-7) ,4) ) +transpose(((X|X) +transpose(step(echo(X,4,6) ,12) ,7) ) ,7) ) ) +(transpose(step(X,12) ,4) +transpose((echo(((X|X) +X) ,4,6) +transpose(X,12) ) ,7) ) ) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) ,12) ) +transpose(step(shuffle(arpeggio(((transpose(X,4) +transpose(shuffle((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) +transpose(((((X+transpose((X|X) ,7) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) +transpose(transpose(X,4) ,7) ) |(arpeggio(X) +transpose(arpeggio(X) ,7) ) ) ,7) ) ) ) ,12) ,4) ) +transpose(((step(transpose((((X+transpose(arpeggio(X) ,12) ) +transpose(((step(X,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) |(echo(X,4,6) |(X|X) ) ) ,-7) ,12) +transpose((((transpose(((echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4,6) +transpose((transpose(arpeggio(X) ,-7) +transpose(echo(step(X,12) ,4,6) ,12) ) ,4) ) +transpose((echo(X,4,6) +transpose(X,12) ) ,7) ) ,4) |transpose(arpeggio(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ,-7) ) +transpose(step(transpose(step((X+transpose((step(X,12) +transpose(transpose(X,-5) ,12) ) ,12) ) ,12) ,4) ,12) ,4) ) +transpose(transpose((((X|X) +(X+transpose(X,7) ) ) +transpose(echo(X,4,6) ,7) ) ,-5) ,7) ) ,4) ) +transpose(transpose(transpose(echo((shuffle(step(transpose(arpeggio(X) ,-5) ,12) ) +transpose(step(X,12) ,7) ) ,4,6) ,-7) ,-7) ,7) ) ,7) ) ,12) ) ) ,7) ) ) ,4,6) ) random seed used was 198988657
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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