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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: | (transpose(transpose(transpose((arpeggio(transpose(((transpose(transpose((X+transpose(X,12) ) ,4) ,4) +transpose(transpose(step(step(arpeggio(X) ,12) ,12) ,-7) ,12) ) +transpose(transpose(arpeggio((step(step(X,12) ,12) +shuffle((X+X) ) ) ) ,-5) ,7) ) ,-7) ) +transpose(transpose((((((echo(step((shuffle(echo(X,4,6) ) |transpose(shuffle((transpose(X,4) |(X+X) ) ) ,-7) ) ,12) ,4,6) +transpose(transpose(shuffle(echo((shuffle((X+transpose(step(X,12) ,12) ) ) |shuffle(transpose(X,4) ) ) ,4,6) ) ,-5) ,4) ) +transpose(step(arpeggio(((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose((transpose(X,-5) +transpose(X,-7) ) ,4) ) +transpose(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,4,6) ,7) ) ) ,12) ,7) ) +transpose(echo((((((step(echo(((shuffle(transpose(X,-7) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(echo(arpeggio(X) ,4,6) ,7) ) ,4,6) ,12) +transpose((transpose(X,-5) |echo(X,4,6) ) ,4) ) +transpose(shuffle(((X+transpose(X,7) ) +transpose(X,12) ) ) ,7) ) |arpeggio((step(X,12) |((shuffle(X) |transpose(X,-5) ) |step(echo(X,4,6) ,12) ) ) ) ) +transpose(((((step(arpeggio(X) ,12) +transpose(shuffle((transpose(X,-5) +arpeggio(X) ) ) ,4) ) +transpose(transpose(transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,4) ,4) ,7) ) +transpose(echo((echo(shuffle(X) ,4,6) |arpeggio(arpeggio(X) ) ) ,4,6) ,7) ) +((transpose(X,-5) |((X+transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(echo(transpose(arpeggio(X) ,-7) ,4,6) ,7) ) ) +(shuffle(((step((X|X) ,12) +transpose((X|arpeggio(X) ) ,4) ) +transpose(X,7) ) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ) ) ,4) ) +transpose(((transpose(echo(X,4,6) ,4) +transpose((step((shuffle(X) +arpeggio(X) ) ,12) +arpeggio(((X|X) +transpose(transpose(X,-5) ,12) ) ) ) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ,7) ) ,4,6) ,4) ) +transpose(arpeggio(transpose((transpose(step(arpeggio(transpose(X,4) ) ,12) ,4) +((transpose(transpose((X+X) ,-5) ,4) +transpose(transpose(((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,4) ,4) ) +transpose(step(echo((X+X) ,4,6) ,12) ,7) ) ) ,-5) ) ,7) ) +transpose(echo(step(step(arpeggio(X) ,12) ,12) ,4,6) ,12) ) ,-7) ,7) ) ,4) ,4) ,4) +(shuffle(shuffle(transpose((echo(arpeggio((echo(transpose(((((transpose(X,-7) +(X|X) ) +transpose(step(X,12) ,4) ) +transpose(step(X,12) ,7) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ,4) ,4,6) +transpose(((((shuffle(arpeggio(X) ) +transpose(((arpeggio(X) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(shuffle((((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ,7) ) +transpose((arpeggio(echo(X,4,6) ) +transpose(transpose(arpeggio(shuffle(X) ) ,-7) ,12) ) ,4) ) +transpose(transpose(transpose(X,-5) ,4) ,7) ) ,12) ) ) ,4,6) +transpose(transpose(step((transpose(X,-5) |transpose((shuffle((X|X) ) +transpose((((X+transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,-5) ) ,12) ,-5) ,-7) ) ,4) ) ) +((((step(arpeggio(arpeggio(echo(((shuffle(((X+transpose(step(X,12) ,4) ) +transpose(step(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,7) ) ) +transpose((shuffle(((echo(X,4,6) +transpose(arpeggio(X) ,4) ) +transpose((X+X) ,7) ) ) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,4) ,12) ) ,4) ) +transpose(((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(X,7) ) +transpose(echo(step(X,12) ,4,6) ,4) ) +transpose(transpose(step(step(X,12) ,12) ,-5) ,7) ) ,12) ) ,4,6) ) ) ,12) +transpose((transpose(transpose(((arpeggio(echo(transpose((echo(echo(transpose(X,4) ,4,6) ,4,6) +transpose(echo(((((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,4,6) ,12) ) ,-5) ,4,6) ) +transpose((echo(((step(echo(((transpose((X+X) ,-5) +transpose((X+X) ,4) ) +transpose(((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,4,6) ,12) +transpose(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ,-7) ,4) ) +transpose(step(echo((step(X,12) +transpose((X+transpose(X,7) ) ,12) ) ,4,6) ,12) ,7) ) ,4,6) +arpeggio(arpeggio((transpose(echo(X,4,6) ,-5) +transpose((X|echo(X,4,6) ) ,4) ) ) ) ) ,4) ) +transpose(arpeggio((echo(transpose(transpose(shuffle(X) ,4) ,4) ,4,6) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) ) ,7) ) ,4) ,4) +transpose(step(transpose(arpeggio(((transpose(X,4) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) |shuffle(transpose((X|X) ,4) ) ) ) ,-5) ,12) ,7) ) ,4) ) +transpose(shuffle(((step(echo(shuffle((echo(transpose(X,4) ,4,6) +transpose(X,7) ) ) ,4,6) ,12) +transpose(arpeggio((shuffle(((((((((echo(X,4,6) +(X+X) ) +transpose((X|X) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) |step((X|X) ,12) ) +transpose(echo((transpose(X,-5) +X) ,4,6) ,-5) ) +transpose(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) +transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose(((arpeggio(echo(X,4,6) ) +transpose((X+transpose(shuffle(X) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,4) ,4) ) +transpose(X,7) ) |(transpose(((transpose(echo(X,4,6) ,-7) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) ,4) +transpose(step((X+transpose(transpose(X,-7) ,12) ) ,12) ,7) ) ) ) +(transpose(transpose(X,-5) ,-7) |arpeggio(arpeggio(transpose(transpose(arpeggio(((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) ) ,4) ,-5) ) ) ) ) ) ,4) ) +transpose((echo((((transpose(echo(X,4,6) ,-5) +transpose(arpeggio(echo((X+transpose(X,12) ) ,4,6) ) ,4) ) +transpose(transpose(arpeggio(((X+transpose(echo(X,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,-7) ,7) ) +((transpose((X|(X+transpose(X,7) ) ) ,-7) +transpose(shuffle(shuffle((X+X) ) ) ,4) ) +transpose(echo((transpose(X,-7) |step(X,12) ) ,4,6) ,7) ) ) ,4,6) +transpose(step((((((transpose(X,4) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) +shuffle(X) ) +transpose(((step((X|X) ,12) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(shuffle(step(transpose(X,-5) ,12) ) ,7) ) ,12) ,4) ) ,7) ) ) ,7) ) +transpose(arpeggio((((step(arpeggio(((((((step(X,12) +transpose(shuffle((X+transpose(echo(transpose(X,4) ,4,6) ,12) ) ) ,4) ) +transpose((transpose(X,-5) +shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) +transpose((echo(echo((X+X) ,4,6) ,4,6) +transpose(transpose(shuffle((X+transpose(X,12) ) ) ,-7) ,7) ) ,4) ) +transpose(transpose(echo(shuffle(X) ,4,6) ,-7) ,7) ) +transpose((transpose(((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,-5) |((X+transpose(transpose(transpose(((X|X) +transpose(X,12) ) ,4) ,-7) ,4) ) +transpose(((((X+transpose(X,12) ) +transpose(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,7) ) ) ,4) ) +transpose((X+(X+X) ) ,7) ) ) ,12) +((((((arpeggio(echo(echo(arpeggio(step(transpose(X,4) ,12) ) ,4,6) ,4,6) ) +transpose(echo(shuffle(transpose((((X+X) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ) ,4,6) ,4) ) +transpose((((transpose(shuffle(arpeggio(X) ) ,-5) +X) +transpose(step((step(X,12) |shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,7) ) +transpose(echo((shuffle(echo((((X|X) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(shuffle(X) ,7) ) ,4,6) ) +(((transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(transpose(step(X,12) ,4) ,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(arpeggio(((step((X|X) ,12) +transpose(((echo(X,4,6) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ) ,7) ) ) ,4,6) ,4) ) +transpose(echo(shuffle(transpose(transpose(X,-5) ,4) ) ,4,6) ,7) ) +transpose(shuffle(shuffle(transpose(((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4) ) ) ,4) ) +transpose((((transpose(step(step(((X+transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,12) ,12) ,-7) |echo(shuffle(echo(transpose(X,4) ,4,6) ) ,4,6) ) +transpose((transpose((arpeggio((transpose(X,-5) +transpose(X,7) ) ) +transpose((shuffle(step(X,12) ) +echo(transpose(X,4) ,4,6) ) ,7) ) ,-5) |step((((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(transpose(arpeggio(X) ,-7) ,12) ) ,12) ) ,4) ) +transpose(shuffle(arpeggio((arpeggio(X) +shuffle(X) ) ) ) ,7) ) ,7) ) ) +transpose(arpeggio(step((echo(arpeggio(step(arpeggio(echo(X,4,6) ) ,12) ) ,4,6) +transpose(arpeggio(shuffle(step((X+X) ,12) ) ) ,-7) ) ,12) ) ,4) ) +transpose(echo((shuffle((echo(X,4,6) +X) ) |transpose(transpose(step(echo((arpeggio(X) +transpose((X+X) ,12) ) ,4,6) ,12) ,-7) ,4) ) ,4,6) ,7) ) ) ,4) ) +transpose(arpeggio((step(transpose(((transpose(step(shuffle(echo((X|X) ,4,6) ) ,12) ,4) +transpose(transpose(echo((transpose(X,-5) +transpose((X|X) ,12) ) ,4,6) ,-7) ,12) ) +transpose(transpose(transpose(((X+transpose(step(step(X,12) ,12) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) ,4) ,-7) ,7) ) ,-5) ,12) +transpose(shuffle((transpose(((X+transpose(X,7) ) |((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(arpeggio((X|X) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,-7) +transpose(arpeggio(step(transpose((X|transpose(X,4) ) ,-5) ,12) ) ,7) ) ) ,-7) ) ) ,7) ) ) ) random seed used was 13376428
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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