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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 15 generations the expression "X" became this: | (transpose((step((((arpeggio((transpose((X|shuffle(X) ) ,4) +transpose((X+X) ,12) ) ) +transpose((((step(X,12) |X) +X) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,12) ) +(shuffle(transpose(X,-5) ) |transpose(transpose(X,4) ,-7) ) ) +transpose((transpose(transpose(transpose(X,-5) ,4) ,-7) |transpose(arpeggio(arpeggio(X) ) ,-7) ) ,7) ) ,12) +((step((transpose(echo(transpose(transpose(X,4) ,-5) ,4,6) ,4) +shuffle(transpose(((X+X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) ) ,12) +transpose(transpose(((transpose(transpose(X,-5) ,-7) |(echo(X,4,6) +transpose(X,7) ) ) +transpose((step((X+transpose(X,12) ) ,12) +((X+transpose(step(X,12) ,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) ,-5) ,4) ) +transpose(shuffle(((step(((transpose(X,-5) +transpose(transpose(X,4) ,12) ) |shuffle(transpose(arpeggio(X) ,4) ) ) ,12) +transpose((step(transpose(X,-7) ,12) |transpose((X+transpose(X,12) ) ,-5) ) ,4) ) +transpose((transpose((X+X) ,-7) |((shuffle((X|X) ) |transpose((X|X) ,4) ) |transpose(shuffle(step(X,12) ) ,-7) ) ) ,7) ) ) ,7) ) ) ,4) +transpose(((((transpose(echo(((echo((transpose(arpeggio(step(X,12) ) ,4) +transpose(((X+transpose(X,12) ) +transpose(transpose(X,4) ,4) ) ,-5) ) ,4,6) +transpose((((X+X) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(shuffle(X) ,-5) ,12) ) ,-7) ) +transpose(((((X|echo(X,4,6) ) +transpose(transpose(transpose(X,-7) ,4) ,4) ) |transpose(((transpose(X,4) +transpose(transpose(X,-7) ,7) ) |(((X+transpose(X,7) ) |transpose(X,-5) ) +((X+transpose(X,4) ) +transpose((X|X) ,7) ) ) ) ,-7) ) +transpose(arpeggio((echo((X+X) ,4,6) |(transpose(transpose(X,-7) ,4) |X) ) ) ,4) ) ,12) ) ,4,6) ,-5) +transpose(echo((transpose(transpose(arpeggio(echo(X,4,6) ) ,4) ,4) |((step(step(transpose(X,-5) ,12) ,12) |transpose(transpose(transpose(step(X,12) ,-5) ,-5) ,4) ) +transpose((transpose(transpose(step(transpose(X,4) ,12) ,4) ,-5) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,7) ) ) ,4,6) ,4) ) +transpose(shuffle((shuffle((transpose(transpose((echo((X+transpose(X,12) ) ,4,6) +transpose((X|step(X,12) ) ,12) ) ,-5) ,-5) +step(transpose(((X+transpose(X,12) ) +X) ,4) ,12) ) ) +transpose((transpose(echo(step(arpeggio(X) ,12) ,4,6) ,4) |(((arpeggio(X) +transpose(((X+X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(X,7) ) +transpose(step((X+arpeggio(X) ) ,12) ,12) ) ) ,12) ) ) ,7) ) +transpose((((transpose(shuffle(((step(((X+transpose(X,7) ) |(((X+transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ) ,12) |transpose(X,4) ) +transpose(transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,4) ,7) ) ) ,-7) +transpose(transpose((transpose((transpose(X,-5) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,-5) +transpose(transpose((transpose(((X+transpose(X,12) ) +transpose(X,-5) ) ,-7) |(shuffle(arpeggio(echo(X,4,6) ) ) |((transpose(step(X,12) ,-5) +transpose(transpose((X|X) ,-5) ,4) ) +transpose((X+transpose((X+X) ,12) ) ,7) ) ) ) ,-7) ,7) ) ,-7) ,12) ) +transpose(transpose((((step(transpose(X,-7) ,12) |step(arpeggio((transpose(X,-5) |X) ) ,12) ) +transpose(transpose(arpeggio(((X+transpose((X|X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,-7) ,12) ) +transpose((shuffle(((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose((shuffle(X) +transpose(transpose(X,-7) ,7) ) ,-5) ,4) ) +transpose((transpose(X,4) +step(X,12) ) ,7) ) ) +transpose(transpose(echo(arpeggio(transpose(X,-5) ) ,4,6) ,-7) ,7) ) ,12) ) ,4) ,7) ) |transpose(transpose(transpose(transpose(step((step(X,12) |transpose(X,-7) ) ,12) ,-7) ,-5) ,4) ,4) ) ,4) ) +transpose(((transpose((((((transpose((X+transpose(transpose((X|X) ,-5) ,12) ) ,-7) |transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ,-5) ) +transpose(X,4) ) +transpose(transpose(((((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((X+X) ,4) ) +transpose((echo(X,4,6) +(X+X) ) ,7) ) ,4) ,7) ) +transpose((((X+transpose(transpose(X,-5) ,7) ) +transpose(transpose(X,-7) ,12) ) |echo(transpose((X+transpose(X,7) ) ,-5) ,4,6) ) ,4) ) +transpose((transpose(((X+transpose(transpose(X,-5) ,7) ) +transpose((step(X,12) |transpose(X,-7) ) ,7) ) ,4) +transpose((step((((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((transpose(X,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,12) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,7) ) ,12) ) ,4) +transpose(transpose(transpose((((transpose(echo(transpose(X,4) ,4,6) ,4) +transpose((transpose(X,-7) |transpose(echo(X,4,6) ,-7) ) ,12) ) +transpose((X+transpose((X|X) ,4) ) ,4) ) +transpose(step((shuffle(X) +transpose(X,7) ) ,12) ,7) ) ,4) ,-7) ,4) ) +transpose((step(transpose((arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) +X) +transpose(X,7) ) ) |((transpose(step(X,12) ,-5) |(echo((X+X) ,4,6) |shuffle(X) ) ) +(X+transpose(X,7) ) ) ) ,-5) ,12) +((echo(((transpose((((transpose(X,-7) +X) +transpose(arpeggio(transpose(X,-7) ) ,7) ) +transpose((X+transpose(X,7) ) ,-5) ) ,4) +transpose((X+X) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,7) ) ,4,6) +transpose(shuffle((transpose(step((X+transpose(X,4) ) ,12) ,-7) |(step(((X+transpose(X,7) ) +transpose(step(X,12) ,12) ) ,12) +transpose(transpose((X+(X+X) ) ,4) ,7) ) ) ) ,4) ) +transpose((transpose(((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +(X+transpose(shuffle(X) ,12) ) ) ,-7) |(echo(echo(X,4,6) ,4,6) +transpose(X,-5) ) ) ,7) ) ) ,7) ) ,7) ) ,12) ) random seed used was 225637797
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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