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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: | ((step(echo((transpose(transpose(echo(echo(arpeggio((X+X) ) ,4,6) ,4,6) ,-5) ,4) +echo((((step((step(X,12) +transpose(step(X,12) ,7) ) ,12) +transpose(transpose((X+transpose(step(X,12) ,7) ) ,4) ,7) ) +transpose(step((arpeggio(shuffle(X) ) +transpose((X+transpose(X,7) ) ,12) ) ,12) ,4) ) +transpose(step((arpeggio(step(transpose(X,-5) ,12) ) +shuffle(X) ) ,12) ,7) ) ,4,6) ) ,4,6) ,12) +transpose(((echo(((arpeggio(transpose(transpose(transpose(((transpose(X,-5) |step(X,12) ) +step(X,12) ) ,4) ,4) ,-7) ) +transpose((echo(((echo((arpeggio(X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) +transpose(transpose(transpose(step(shuffle(X) ,12) ,4) ,-7) ,12) ) +transpose(arpeggio(shuffle(X) ) ,7) ) ,4,6) +transpose(shuffle(transpose(arpeggio((echo((X+transpose(X,12) ) ,4,6) |((transpose(X,-7) +shuffle(X) ) |(transpose(X,4) +((X+X) +transpose(transpose(X,-5) ,12) ) ) ) ) ) ,4) ) ,7) ) ,4) ) +transpose(((transpose(transpose(echo(transpose(X,4) ,4,6) ,-5) ,-5) +transpose(transpose(echo((echo((shuffle(X) +transpose(step(X,12) ,12) ) ,4,6) |((transpose(X,-5) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ) +transpose(step((step(X,12) +(X|X) ) ,12) ,12) ) ) ,4,6) ,4) ,12) ) +transpose(shuffle(step((step((X|X) ,12) +transpose(echo(echo(X,4,6) ,4,6) ,12) ) ,12) ) ,12) ) ,7) ) ,4,6) +transpose((echo(transpose(echo(transpose(transpose(transpose(((step(echo(X,4,6) ,12) +X) +((X+X) |shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,-7) ,-7) ,-7) ,4,6) ,4) ,4,6) +transpose(((arpeggio(step(arpeggio(transpose(transpose(((X+arpeggio(X) ) +shuffle(X) ) ,-5) ,-7) ) ,12) ) +transpose(transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) +shuffle(X) ) +transpose(transpose(step(echo(X,4,6) ,12) ,-5) ,12) ) +(shuffle(shuffle(X) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ) +transpose(transpose(echo((arpeggio(X) |transpose(X,4) ) ,4,6) ,4) ,4) ) +transpose((((transpose((X+X) ,-5) +shuffle(arpeggio((X|X) ) ) ) +transpose(step(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,4) ) +transpose(echo(transpose(transpose(X,4) ,4) ,4,6) ,7) ) ,12) ) ,-7) ,4) ) +transpose(((echo(echo(shuffle((X+transpose(X,12) ) ) ,4,6) ,4,6) +transpose(((transpose(step(echo(transpose(X,-5) ,4,6) ,12) ,4) +transpose(shuffle(transpose((X|X) ,-7) ) ,4) ) +transpose(transpose(arpeggio((step(X,12) +step(X,12) ) ) ,-5) ,7) ) ,-5) ) +transpose(arpeggio((transpose(transpose(transpose(shuffle(X) ,-5) ,4) ,-7) +(((arpeggio(X) +transpose((transpose((echo(X,4,6) +arpeggio(X) ) ,4) +step(X,12) ) ,7) ) +arpeggio(transpose(transpose(X,-5) ,-5) ) ) |((transpose(X,-7) |(X+X) ) |(((transpose(X,4) +X) +transpose(transpose(arpeggio(X) ,4) ,4) ) +transpose(X,7) ) ) ) ) ) ,7) ) ,7) ) ,7) ) ,4) ) +transpose((echo(echo(echo((((transpose(transpose((shuffle(X) +transpose(X,7) ) ,-7) ,-7) +transpose((transpose(transpose(X,-7) ,4) |(step(echo(X,4,6) ,12) +transpose(transpose(X,-5) ,12) ) ) ,7) ) +transpose(((((echo(X,4,6) +transpose(X,12) ) +X) |transpose(step(X,12) ,-7) ) +step(echo((X+transpose(X,7) ) ,4,6) ,12) ) ,4) ) +transpose(transpose((shuffle(step(X,12) ) |echo(echo(shuffle(X) ,4,6) ,4,6) ) ,4) ,7) ) ,4,6) ,4,6) ,4,6) +(transpose(echo(step(echo(step(shuffle(transpose(transpose(X,-5) ,-5) ) ,12) ,4,6) ,12) ,4,6) ,-5) +transpose((transpose(transpose(echo((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4,6) ,-7) ,-5) |(transpose(transpose(arpeggio(arpeggio(transpose(X,4) ) ) ,-5) ,4) +shuffle(((step(X,12) |X) +transpose(shuffle(arpeggio(step(X,12) ) ) ,-7) ) ) ) ) ,-5) ) ) ,7) ) ,7) ) |shuffle((arpeggio(((step(arpeggio(transpose(arpeggio(shuffle(step(transpose(transpose(X,-7) ,-7) ,12) ) ) ,4) ) ,12) |(transpose(transpose((echo(echo(shuffle(X) ,4,6) ,4,6) +transpose(step(echo(((arpeggio(X) +(X+X) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ,4,6) ,12) ,7) ) ,-5) ,-7) +transpose(transpose(transpose(echo((arpeggio(shuffle(echo(X,4,6) ) ) +(((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +X) ) ,4,6) ,-5) ,4) ,7) ) ) +transpose(echo((arpeggio(step(((step(((X+transpose(X,12) ) |transpose(X,-7) ) ,12) +transpose(((((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +(X+X) ) |echo(shuffle(X) ,4,6) ) ,-5) ) |transpose(transpose(step(X,12) ,4) ,-7) ) ,12) ) |echo(echo(arpeggio(arpeggio((X+transpose(X,12) ) ) ) ,4,6) ,4,6) ) ,4,6) ,12) ) ) +transpose((step((echo(transpose(shuffle(shuffle(transpose((X+((X+transpose(X,12) ) +((X|X) +(X+transpose(X,7) ) ) ) ) ,4) ) ) ,-5) ,4,6) +transpose(transpose(shuffle(transpose(arpeggio(transpose(arpeggio(X) ,-5) ) ,-5) ) ,4) ,7) ) ,12) +transpose(((shuffle((transpose(shuffle(X) ,-7) +transpose(echo(transpose(((echo(X,4,6) +transpose((X+X) ,4) ) +transpose((X|X) ,7) ) ,-7) ,4,6) ,7) ) ) |(transpose(echo(echo(echo(X,4,6) ,4,6) ,4,6) ,-7) +(echo((echo((echo(X,4,6) +transpose(X,-7) ) ,4,6) |X) ,4,6) +(echo(transpose(X,4) ,4,6) +transpose(step(echo((X|transpose(X,-5) ) ,4,6) ,12) ,12) ) ) ) ) |(step(arpeggio((transpose(arpeggio(arpeggio((arpeggio(transpose(shuffle((X+X) ) ,-5) ) +transpose(((transpose(arpeggio(X) ,-7) +transpose(((X|X) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) +transpose((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) ,7) ) ,4) ) ) ) ,4) |((((echo(((arpeggio(transpose(X,-5) ) +transpose(echo(transpose((X+X) ,-5) ,4,6) ,4) ) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ,4,6) +echo(transpose(X,-7) ,4,6) ) |step(shuffle(step(X,12) ) ,12) ) +transpose(echo(transpose((X+transpose(X,7) ) ,-5) ,4,6) ,4) ) +transpose(shuffle(step((step(X,12) +transpose(X,12) ) ,12) ) ,7) ) ) ) ,12) |transpose(step(transpose((((step((X+transpose(X,12) ) ,12) |arpeggio(echo(X,4,6) ) ) +shuffle((echo(X,4,6) |echo((X+transpose(X,7) ) ,4,6) ) ) ) +transpose(arpeggio(step(step(X,12) ,12) ) ,-5) ) ,-7) ,12) ,-5) ) ) ,7) ) ,12) ) ) ) random seed used was 211712592
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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