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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: | ((step(((((transpose((X|X) ,4) |(transpose(X,-5) +transpose(((X+transpose(X,7) ) |X) ,12) ) ) |transpose((echo((X+X) ,4,6) +transpose(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ,12) ) ,-5) ) +((transpose(transpose((X+X) ,-5) ,4) |arpeggio((transpose(shuffle(X) ,-7) |(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ,7) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ,7) ) ) ) ) +arpeggio((transpose(transpose(X,-5) ,-7) +transpose(step(transpose(X,4) ,12) ,7) ) ) ) ) +transpose((((((shuffle(X) +((X+transpose(X,12) ) +X) ) +((X|X) +transpose(arpeggio(X) ,4) ) ) +transpose((transpose(X,4) |transpose(transpose(X,4) ,-7) ) ,4) ) +transpose(transpose(transpose((((X+transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,-5) ,-5) ,7) ) +transpose((arpeggio(arpeggio(X) ) +shuffle((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,4) ) ,12) ) ,12) +transpose((((transpose(shuffle(((transpose(transpose(transpose(X,-5) ,-5) ,-5) |((X|(X+X) ) +(echo((X+transpose(X,12) ) ,4,6) +transpose(transpose(X,4) ,7) ) ) ) |(transpose(step((X+transpose(X,12) ) ,12) ,4) |(arpeggio(transpose((X+transpose(X,12) ) ,-7) ) +transpose(transpose(echo(X,4,6) ,-7) ,-7) ) ) ) ) ,4) +transpose((shuffle((shuffle(echo((X|shuffle(X) ) ,4,6) ) +transpose((transpose((((((((X|X) |X) +arpeggio(X) ) +transpose((step(X,12) |transpose((X|X) ,-5) ) ,7) ) +transpose((arpeggio((X+X) ) +transpose(arpeggio(X) ,12) ) ,12) ) +transpose(((transpose(X,4) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose((transpose(X,-7) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) ,4) ,7) ) ,4) +transpose(echo((echo(shuffle(X) ,4,6) |transpose(transpose((X+(X+X) ) ,-7) ,4) ) ,4,6) ,12) ) ,7) ) ) |transpose(shuffle(((echo(transpose(transpose((X+transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,4) ,-7) ,4,6) +transpose(transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +X) ) ,-5) ,4) ) +transpose(step((arpeggio((X+transpose(X,12) ) ) +transpose((X|X) ,-5) ) ,12) ,7) ) ) ,-5) ) ,4) ) +transpose(echo(echo(arpeggio(step(transpose(transpose(shuffle(((((transpose(X,4) +X) +transpose(transpose((X+X) ,4) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) |transpose(transpose(X,-5) ,-7) ) ) ,-7) ,4) ,12) ) ,4,6) ,4,6) ,7) ) +transpose((echo(step(shuffle(transpose(X,4) ) ,12) ,4,6) +transpose(transpose((arpeggio((transpose(transpose((transpose(X,4) |transpose((X+transpose(X,12) ) ,-5) ) ,-7) ,-5) +transpose(((transpose(((transpose(transpose(X,4) ,-5) +transpose((X|((transpose(X,-7) +transpose(transpose(X,-7) ,12) ) |(transpose(X,-7) +X) ) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) +transpose(echo((transpose(((transpose(transpose(X,-5) ,4) +(transpose(X,4) +step(X,12) ) ) +transpose(((echo(X,4,6) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,4) +transpose((step(X,12) |transpose(((X+transpose(X,7) ) +transpose(shuffle(X) ,12) ) ,-5) ) ,7) ) ,4,6) ,4) ) +transpose(echo((shuffle(((X|X) +transpose(transpose(X,4) ,12) ) ) +transpose(step(((((X|X) |(X|X) ) +transpose(((X|X) |(X+transpose(X,12) ) ) ,7) ) +transpose(transpose(((X|X) |echo(X,4,6) ) ,-7) ,7) ) ,12) ,12) ) ,4,6) ,7) ) ,12) ) ) |(transpose(echo((((transpose(transpose(X,4) ,4) +transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) +transpose((step(transpose(X,4) ,12) |((X+X) +X) ) ,7) ) |transpose(transpose(X,4) ,-5) ) ,4,6) ,-7) +transpose(shuffle((step(transpose(transpose(transpose(transpose(X,-7) ,-5) ,-7) ,-5) ,12) +transpose(transpose(step(transpose(X,4) ,12) ,-7) ,12) ) ) ,7) ) ) ,-7) ,12) ) ,7) ) ,4) ) +transpose(arpeggio((((((transpose((step(transpose(X,-7) ,12) |(((X+transpose(X,12) ) |transpose(X,-7) ) +transpose(arpeggio(X) ,-7) ) ) ,-7) +transpose(transpose(((((X+transpose(X,7) ) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose(transpose((X+X) ,4) ,7) ) +(X+transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ) ,4) ,-7) ) +transpose(((transpose(transpose((arpeggio(X) +transpose((echo(X,4,6) +transpose(X,7) ) ,7) ) ,4) ,-5) |transpose((step(X,12) +transpose(transpose(X,-7) ,-5) ) ,4) ) +transpose(transpose(((X+X) +echo(transpose((X+X) ,-7) ,4,6) ) ,-7) ,7) ) ,4) ) +transpose(transpose(transpose(step(((X+transpose(step(X,12) ,4) ) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,12) ,-5) ,4) ,7) ) +(shuffle(((((((X|X) +transpose(transpose(X,-7) ,7) ) +(transpose(X,-7) +transpose(X,7) ) ) +echo(transpose(X,-5) ,4,6) ) +transpose((echo(X,4,6) |step(((X+transpose(X,7) ) +transpose((X+X) ,7) ) ,12) ) ,4) ) +transpose(step(transpose((X|X) ,4) ,12) ,7) ) ) +(transpose(transpose(transpose(transpose((X+X) ,-7) ,-5) ,-7) ,4) |transpose((((echo(transpose(X,-7) ,4,6) +((((X|X) |(X|X) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(((X+X) +transpose(echo(X,4,6) ,-5) ) ,12) ) ) +transpose((((((X+X) |X) |arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ) ) |step(transpose(transpose(X,-7) ,-7) ,12) ) +transpose((echo(X,4,6) +transpose(transpose(((X+transpose((X|X) ,4) ) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,-5) ,12) ) ,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) ) ) |((transpose(transpose(X,4) ,-5) +transpose(transpose(((((X|X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose((X|X) ,4) ,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) ,4) ,7) ) +transpose((transpose(step(echo(X,4,6) ,12) ,-7) |transpose((step(transpose(X,-7) ,12) +transpose(transpose((transpose(X,-5) +(X+X) ) ,-7) ,12) ) ,-5) ) ,12) ) ) ) ,7) ) random seed used was 168188555
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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