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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(shuffle(transpose(((((transpose(X,4) +transpose((X|X) ,12) ) |arpeggio((X|X) ) ) +transpose(transpose(transpose(X,-7) ,-7) ,12) ) +(((X+transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +step(transpose(X,-5) ,12) ) ) ,4) ) ,-7) +transpose(step(step(transpose(transpose(X,-7) ,-7) ,12) ,12) ,7) ) ,-5) +transpose((((echo(((transpose((X+transpose(X,7) ) ,4) |(arpeggio((X|X) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) |shuffle(step((((arpeggio(echo(X,4,6) ) +echo((X|X) ,4,6) ) +(X+transpose(transpose(X,4) ,12) ) ) +transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,12) ) ) ,4,6) +transpose(transpose(((transpose(X,-7) +X) +transpose(transpose(X,-5) ,-7) ) ,4) ,12) ) +step((((((X+transpose(step(X,12) ,-7) ) +transpose((transpose((X+transpose(X,12) ) ,-7) |transpose((X+X) ,-5) ) ,12) ) +transpose((arpeggio(transpose((transpose(X,4) |transpose(X,-7) ) ,4) ) +transpose(step(echo(X,4,6) ,12) ,7) ) ,12) ) +transpose(((transpose(echo(echo(X,4,6) ,4,6) ,-7) +transpose((((X|shuffle(X) ) +(((X+X) +transpose(arpeggio(X) ,12) ) +transpose((X+X) ,7) ) ) +((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(arpeggio((X+X) ) ,7) ) +transpose(transpose(X,-7) ,-7) ) ) ,12) ) |(transpose(transpose(X,4) ,-7) +transpose(transpose((transpose(X,4) +transpose(transpose(X,4) ,7) ) ,4) ,7) ) ) ,4) ) +transpose(((transpose(arpeggio(transpose(transpose(echo(X,4,6) ,-5) ,-5) ) ,-7) +transpose(((step(transpose(X,-7) ,12) |transpose(((transpose(X,-5) +transpose((X+X) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ,-5) ) +(transpose(transpose(X,-5) ,-5) +transpose(transpose((transpose(X,-5) |shuffle(X) ) ,-5) ,7) ) ) ,4) ) +transpose(transpose(((echo(shuffle((X+X) ) ,4,6) +transpose(transpose(((X+transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ,4) ) +transpose((shuffle(X) |transpose(X,4) ) ,7) ) ,-7) ,7) ) ,7) ) ,12) ) +((step(X,12) +transpose(transpose(X,-5) ,7) ) +transpose(echo(shuffle(transpose((shuffle(transpose(X,-7) ) +transpose(X,-5) ) ,4) ) ,4,6) ,12) ) ) ,12) ) +transpose(((((transpose(transpose(transpose(arpeggio(transpose(X,4) ) ,-5) ,-7) ,-5) +transpose(transpose(echo(((((arpeggio(arpeggio(transpose(X,-5) ) ) +(X|(X+transpose(X,12) ) ) ) +transpose(echo((step(X,12) +transpose(X,12) ) ,4,6) ,4) ) +transpose(transpose(((X+(X+X) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,7) ) +transpose(((transpose(X,4) |echo(X,4,6) ) |((X+transpose((X|X) ,12) ) +X) ) ,-5) ) ,4,6) ,-7) ,4) ) +transpose(transpose((((echo(transpose(transpose(((X|X) +transpose((echo(X,4,6) +X) ,7) ) ,-5) ,4) ,4,6) |transpose(transpose(X,-7) ,-5) ) +transpose((((echo(transpose(transpose(transpose(X,-5) ,-5) ,4) ,4,6) |((transpose(((X|X) |X) ,-7) +transpose((arpeggio(arpeggio(echo(X,4,6) ) ) +(arpeggio(echo(X,4,6) ) +transpose(arpeggio(transpose(X,-5) ) ,12) ) ) ,4) ) +transpose((transpose(step((X+transpose(X,12) ) ,12) ,-5) |(arpeggio(X) +X) ) ,7) ) ) +transpose(step(transpose(((X+transpose(X,12) ) |X) ,4) ,12) ,4) ) +transpose(transpose((transpose((echo(X,4,6) +X) ,4) |(transpose((echo(X,4,6) |X) ,4) +transpose(transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ,7) ) ) ,4) ,7) ) ,7) ) +arpeggio(((transpose((((echo((transpose(X,-5) |transpose(X,-5) ) ,4,6) +transpose(transpose((transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,4) ) +transpose(shuffle((echo(X,4,6) +X) ) ,7) ) +transpose((transpose(transpose(transpose(X,-5) ,4) ,4) +transpose(shuffle(step(echo(X,4,6) ,12) ) ,12) ) ,7) ) ,-5) |(echo(X,4,6) +(transpose(X,4) +transpose(X,7) ) ) ) +transpose(transpose(((echo(echo(X,4,6) ,4,6) +transpose(transpose(arpeggio(transpose(X,4) ) ,-7) ,4) ) +transpose(step(((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ,7) ) ,-7) ,-5) ) ) ) ,-5) ,7) ) +transpose(arpeggio(transpose(((step((((transpose(X,-7) +(X+transpose(X,7) ) ) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,12) +transpose(((X+transpose(X,4) ) +transpose(transpose((transpose(X,-5) +(X+transpose(X,7) ) ) ,4) ,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ,-5) ) ,-7) ) +((shuffle(transpose(((echo((((X+X) +transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(((transpose(step(X,12) ,-7) +transpose(echo((transpose((transpose(X,4) +transpose(X,-7) ) ,-7) +transpose(transpose(X,-5) ,12) ) ,4,6) ,4) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ,4) ) |((transpose(transpose((transpose((transpose(arpeggio((X+X) ) ,-5) +transpose(((X+transpose(echo(X,4,6) ,7) ) |transpose(X,-5) ) ,12) ) ,-7) +(step(shuffle(transpose(X,-7) ) ,12) |transpose((X+transpose(X,12) ) ,-7) ) ) ,-5) ,4) +transpose(shuffle(transpose((arpeggio((transpose(X,-5) +step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) |arpeggio(transpose(shuffle(X) ,4) ) ) ,4) ) ,7) ) +transpose((transpose(transpose(transpose(transpose(X,-5) ,-7) ,4) ,4) +transpose(transpose(transpose(echo(step(transpose(transpose(X,-7) ,-7) ,12) ,4,6) ,-5) ,-7) ,12) ) ,4) ) ) +((transpose(transpose(transpose(transpose((X+transpose((arpeggio(X) +shuffle(X) ) ,7) ) ,4) ,-7) ,4) ,-7) +transpose(echo((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(echo((transpose(((X|X) +(X+transpose(X,12) ) ) ,4) +(echo((X+transpose(X,7) ) ,4,6) +transpose(transpose(X,-5) ,-7) ) ) ,4,6) ,12) ) +transpose(transpose(transpose(transpose(step((arpeggio(echo(X,4,6) ) |transpose((X+transpose(X,12) ) ,-7) ) ,12) ,-7) ,-5) ,-5) ,4) ) +transpose(transpose(transpose(transpose((transpose(X,-5) +transpose(((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose((transpose(X,-7) +X) ,7) ) |arpeggio(X) ) ,7) ) ,4) ,-7) ,-7) ,7) ) ,4,6) ,4) ) +transpose(transpose((step(transpose(transpose(transpose(transpose(X,-5) ,-7) ,4) ,-7) ,12) |shuffle(step(transpose(((X|transpose(X,4) ) |(step(X,12) |arpeggio(transpose(X,4) ) ) ) ,-7) ,12) ) ) ,4) ,7) ) ) ) ,12) ) ,-5) random seed used was 233644186
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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