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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 16 generations the expression "X" became this: | (((echo(transpose(echo((shuffle((transpose((transpose(shuffle((X+transpose(X,12) ) ) ,-7) +transpose(transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,7) ) ,-5) +transpose((((transpose(X,4) +X) +(X+step(X,12) ) ) +transpose(arpeggio(X) ,7) ) ,4) ) ) +((echo((((((X+transpose(X,7) ) +X) +transpose(((X+X) |step((X+X) ,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(((transpose(X,-5) +transpose(step(X,12) ,12) ) |transpose(step(X,12) ,-5) ) ,7) ) ,4,6) +transpose((echo(transpose(transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,-7) ,-7) ,4,6) +transpose(transpose((transpose(transpose((X|X) ,-5) ,4) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ,4) ,12) ) ,4) ) +transpose((transpose(arpeggio(arpeggio(transpose(transpose(X,-7) ,-5) ) ) ,-7) |transpose(transpose(((X+transpose((X+X) ,4) ) +transpose(X,7) ) ,4) ,-5) ) ,7) ) ) ,4,6) ,4) ,4,6) +transpose((((transpose(step(transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,-5) ,12) ,4) +transpose(transpose((transpose(transpose(transpose((X|transpose(transpose((X|X) ,-5) ,4) ) ,-5) ,-5) ,-7) +transpose(transpose(shuffle(transpose(transpose(X,-7) ,-7) ) ,4) ,7) ) ,-7) ,4) ) +transpose((transpose(transpose(transpose(((X+X) +transpose(step(X,12) ,7) ) ,-5) ,4) ,-5) |transpose(((transpose(transpose(X,-5) ,4) +transpose(transpose(X,-5) ,12) ) |shuffle(arpeggio((X+step(X,12) ) ) ) ) ,-7) ) ,7) ) +transpose(arpeggio(((((((X+X) +X) |transpose(echo(transpose(X,4) ,4,6) ,4) ) |((transpose((X+X) ,4) +arpeggio(transpose(X,-7) ) ) |((X+transpose(X,12) ) +(X+transpose(X,7) ) ) ) ) |(transpose(X,-5) +transpose(arpeggio((transpose(X,4) +transpose(X,12) ) ) ,7) ) ) +transpose((arpeggio(transpose(transpose(transpose(step(shuffle(X) ,12) ,4) ,4) ,-5) ) +transpose(transpose((transpose(transpose(X,4) ,-7) +transpose(X,12) ) ,-5) ,-5) ) ,12) ) ) ,7) ) ,12) ) |arpeggio(((transpose(transpose(((arpeggio(shuffle(transpose(transpose(X,-7) ,-5) ) ) +transpose(transpose(((X+X) +X) ,-7) ,4) ) +transpose((transpose(X,-5) +transpose((X|(X+transpose(X,12) ) ) ,7) ) ,7) ) ,-5) ,-5) +transpose(((echo(arpeggio((X+transpose(X,7) ) ) ,4,6) +transpose((shuffle(X) +X) ,4) ) +transpose(transpose(shuffle((X+transpose(X,12) ) ) ,-5) ,7) ) ,4) ) +transpose(arpeggio(arpeggio((transpose(transpose(X,-5) ,-5) |(X+transpose(transpose(X,-5) ,7) ) ) ) ) ,7) ) ) ) +transpose(shuffle((transpose((((transpose(((((arpeggio((X|X) ) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(X,4) ,12) ) |echo(echo(((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,7) ) |transpose(X,-7) ) ,7) ) ,4,6) ,4,6) ) |transpose(((X+transpose(X,12) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,4) ) ,-5) |arpeggio(transpose((transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) +((X+X) +(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) |transpose(X,-5) ) ) ) ,-5) ) ) +transpose((transpose(transpose((((transpose(X,-7) +(X+transpose(X,12) ) ) +((X+transpose(X,12) ) +X) ) +transpose(step(echo(X,4,6) ,12) ,7) ) ,-5) ,4) +transpose(transpose(((transpose(echo(X,4,6) ,-7) +transpose(X,-5) ) +transpose(X,-7) ) ,-7) ,7) ) ,7) ) |transpose(transpose(((transpose(((X|X) +transpose(X,4) ) ,4) +transpose(transpose((arpeggio((X+transpose(X,12) ) ) +transpose(shuffle(X) ,7) ) ,-5) ,4) ) +transpose(((((X|X) +transpose(((X+X) +transpose(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) +transpose((transpose(X,-5) +(X+X) ) ,12) ) ,7) ) ,-7) ,4) ) ,-5) |(((((((step(X,12) +X) |transpose((X+X) ,4) ) +transpose(((((X+transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(((transpose(X,-7) +transpose(X,12) ) |(transpose(X,4) |transpose(X,-7) ) ) ,12) ) ,7) ) +(echo(transpose(((X+transpose(X,12) ) +transpose((X|X) ,7) ) ,4) ,4,6) |arpeggio(echo(transpose(X,-7) ,4,6) ) ) ) |((transpose(((X+transpose(X,7) ) |((X+X) |X) ) ,4) +transpose(((X+transpose((X+X) ,12) ) |transpose(X,4) ) ,-5) ) |shuffle(step((X+transpose(X,12) ) ,12) ) ) ) |(transpose(transpose(transpose(shuffle(transpose(X,-7) ) ,4) ,-7) ,4) |(arpeggio(((step(echo(X,4,6) ,12) |((((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose(X,7) ) |transpose(shuffle((X+transpose(X,7) ) ) ,-7) ) ) |transpose(arpeggio(transpose(X,-5) ) ,4) ) ) +transpose(arpeggio(transpose((((transpose(X,4) +transpose((X+transpose(X,12) ) ,12) ) +transpose(step(X,12) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) ) ,4) ) ) ) +transpose((((transpose((shuffle(arpeggio((transpose(X,-7) +transpose(((X|X) +transpose(X,7) ) ,12) ) ) ) +transpose(transpose(((transpose(X,4) +(X+X) ) +transpose((((X+X) +transpose(X,4) ) +transpose((X|X) ,7) ) ,7) ) ,4) ,7) ) ,4) +transpose((step((echo(transpose(X,-5) ,4,6) +arpeggio((X+transpose(X,12) ) ) ) ,12) |echo((((transpose(X,-7) +X) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(shuffle(X) ,4) ,7) ) ,4,6) ) ,7) ) +step(((transpose(transpose(step((X+X) ,12) ,4) ,-5) +transpose((X|(transpose(X,-5) +transpose(transpose(X,4) ,7) ) ) ,7) ) +transpose((((transpose((X|X) ,4) +transpose((X+transpose(X,12) ) ,12) ) |shuffle((X|(X+X) ) ) ) +transpose(transpose(X,-5) ,12) ) ,12) ) ,12) ) |transpose((((transpose(arpeggio(X) ,-5) +((step(X,12) +transpose(X,12) ) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) ) +transpose((transpose(((shuffle(X) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) |echo(shuffle(X) ,4,6) ) ,4) ) +transpose(transpose((((transpose(X,-7) +X) +transpose(transpose(X,4) ,4) ) +transpose((((X|X) +transpose(X,4) ) +transpose((X|X) ,7) ) ,7) ) ,-7) ,7) ) ,-7) ) ,12) ) ) ) ,7) ) random seed used was 103416436
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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