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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(arpeggio((((transpose(shuffle((X+X) ) ,-5) +(step(X,12) +transpose((X|transpose(X,-5) ) ,7) ) ) +transpose((shuffle(transpose(transpose(X,4) ,4) ) +(echo(transpose(X,-5) ,4,6) +(transpose(X,-5) |echo(X,4,6) ) ) ) ,4) ) +transpose(((step(X,12) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) +transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) |X) ,12) ) ,7) ) ) ,-7) ,-5) ,-7) ,4) +transpose((arpeggio(arpeggio(((((transpose(X,-5) |(X|(X+transpose(X,7) ) ) ) +transpose(shuffle((X|X) ) ,12) ) +(arpeggio((X+transpose(X,7) ) ) +step(X,12) ) ) +step(step((X+transpose(X,12) ) ,12) ,12) ) ) ) +transpose(((arpeggio(((((X+transpose(X,12) ) +transpose((X|X) ,4) ) +transpose((X+transpose(X,-7) ) ,7) ) |transpose(transpose(X,-7) ,-7) ) ) +transpose((transpose(echo((((X|X) +transpose(((X+transpose(X,12) ) |(X+X) ) ,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,-5) +echo((((((X+X) |transpose(X,-7) ) |((X+transpose(X,7) ) +transpose(X,-5) ) ) +transpose(transpose((X|X) ,-7) ,4) ) +transpose(transpose(transpose(transpose(X,4) ,-5) ,-7) ,7) ) ,4,6) ) ,4) ) +transpose((transpose(transpose((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) ,-7) ,-7) +transpose((arpeggio((step(transpose(X,4) ,12) +transpose(arpeggio(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ) ,7) ) ) +transpose(((shuffle(X) |(X+X) ) +transpose((X|X) ,-7) ) ,12) ) ,7) ) ,7) ) ,4) ) ,7) ) +(((step(transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) ,-5) |shuffle(shuffle(X) ) ) ,-5) ,12) +transpose(step((transpose(echo(arpeggio((X+X) ) ,4,6) ,4) +step(((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-5) +transpose(echo(transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ,4,6) ,4) ) +transpose(shuffle(shuffle((step(X,12) |(X+transpose(X,7) ) ) ) ) ,7) ) ,12) ) ,12) ,-7) ) |(((((((((transpose((X+transpose(X,12) ) ,-5) +transpose(transpose(X,4) ,4) ) +transpose(step(X,12) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(((echo(X,4,6) +transpose((X|X) ,4) ) +transpose((X|X) ,7) ) ,7) ) +transpose((transpose(X,-5) |transpose((X+transpose(X,7) ) ,4) ) ,7) ) ,7) ) +transpose(transpose(transpose(step((X+transpose(X,12) ) ,12) ,-5) ,-5) ,-7) ) +(((step(transpose(arpeggio(transpose(X,-7) ) ,-5) ,12) +transpose((echo(X,4,6) +X) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) +transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,12) ) ) |(((transpose(((step(shuffle((X|X) ) ,12) +transpose((((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) +echo(X,4,6) ) ,4) ) +transpose((transpose(X,-5) +shuffle(X) ) ,7) ) ,-7) +transpose(((X+(shuffle(transpose(X,4) ) +(X+transpose(X,12) ) ) ) +transpose((transpose(shuffle(X) ,4) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose((step(X,12) +transpose(X,4) ) ,7) ) ,12) ) ,7) ) ,4) ) +transpose((((step(X,12) +(X|transpose((X+X) ,-7) ) ) |transpose((X+transpose(X,7) ) ,-7) ) +transpose(transpose(X,4) ,-5) ) ,7) ) |(step((((((transpose(X,-7) +transpose((echo(X,4,6) +echo(X,4,6) ) ,4) ) +transpose(((X+X) |(X|X) ) ,7) ) +transpose(transpose(X,4) ,7) ) +transpose((echo(((X|X) +transpose((X+X) ,7) ) ,4,6) +transpose(step(shuffle((X+transpose(X,12) ) ) ,12) ,12) ) ,4) ) +transpose(((transpose(X,-5) |shuffle(transpose(X,4) ) ) +shuffle((X|X) ) ) ,7) ) ,12) +transpose(arpeggio(transpose((transpose(X,-7) +(transpose(transpose(X,4) ,-7) +echo(X,4,6) ) ) ,-7) ) ,7) ) ) ) +transpose(transpose(transpose((shuffle(transpose(transpose(transpose(X,-7) ,4) ,4) ) +(transpose(transpose(X,-5) ,4) |(transpose(step(X,12) ,4) +transpose(X,-5) ) ) ) ,4) ,4) ,4) ) +transpose(shuffle((arpeggio(transpose(step(arpeggio(shuffle((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(transpose(X,-5) ,12) ) ) ) ,12) ,4) ) +transpose(((step((((((X+transpose(X,12) ) +transpose((X+X) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) |(((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ) |(step(X,12) +transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) ) ,12) |(((transpose(X,-5) +transpose(transpose(X,4) ,7) ) +((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose(shuffle(X) ,12) ) ) +transpose(((transpose(step(step((X|X) ,12) ,12) ,-7) |arpeggio(transpose(step(X,12) ,4) ) ) |transpose(transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ,-5) ) ,7) ) ,7) ) ) ,7) ) ) +(arpeggio(transpose(((((transpose((transpose((X+X) ,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) +transpose((transpose(arpeggio(transpose(X,-5) ) ,-7) |transpose((X+transpose(X,12) ) ,-7) ) ,4) ) +transpose((step(echo((shuffle(((X|X) |transpose(X,-5) ) ) |((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ) ,4,6) ,12) +shuffle((transpose(X,-5) +transpose(echo(X,4,6) ,12) ) ) ) ,7) ) ,-5) ) |transpose(echo((echo(echo(transpose(transpose(transpose(X,4) ,-5) ,4) ,4,6) ,4,6) +((((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,12) ) |X) ,7) ) +transpose((transpose(step(X,12) ,4) |(X+transpose((X+transpose(X,12) ) ,7) ) ) ,7) ) +transpose(transpose(X,4) ,-7) ) ) ,4,6) ,-7) ) ) ) +transpose(arpeggio(step(echo(step(transpose(shuffle((transpose(echo((X+transpose(X,7) ) ,4,6) ,-7) +transpose(transpose(transpose(step(transpose(((((shuffle(X) +(X+X) ) +transpose(transpose(X,4) ,7) ) +transpose(transpose(transpose((X+X) ,-7) ,-5) ,4) ) +transpose((((echo(X,4,6) +transpose(X,4) ) +transpose((X|X) ,7) ) +step((X+X) ,12) ) ,7) ) ,-5) ,12) ,4) ,-7) ,7) ) ) ,-7) ,12) ,4,6) ,12) ) ,7) ) random seed used was 234066649
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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