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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 20 generations the expression "X" became this: | (shuffle((echo(transpose(step(((transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,-7) ,-7) +transpose(((step(arpeggio(arpeggio(echo(X,4,6) ) ) ,12) +transpose((arpeggio((X|X) ) |arpeggio(transpose((X+transpose(X,12) ) ,4) ) ) ,4) ) +transpose((transpose(echo((X+X) ,4,6) ,4) +transpose(X,-7) ) ,7) ) ,7) ) +transpose(transpose(step(transpose(arpeggio((X+X) ) ,-5) ,12) ,4) ,12) ) ,12) ,4) ,4,6) |arpeggio((echo(transpose(transpose((transpose(transpose(step(echo(((X+transpose(X,12) ) |X) ,4,6) ,12) ,-7) ,-7) |(arpeggio(transpose((((X+X) +transpose(echo(step(X,12) ,4,6) ,4) ) +transpose(((transpose(X,-5) +transpose(X,12) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,7) ) ,-5) ) +transpose(step(((step(transpose(transpose(X,4) ,-5) ,12) |transpose((X+transpose((X|X) ,7) ) ,-5) ) +transpose(((((transpose(step(X,12) ,-7) +transpose((X+transpose(X,7) ) ,12) ) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) +transpose(transpose(X,-5) ,12) ) ,-5) ) ,12) ,7) ) ) ,4) ,-7) ,4,6) +transpose((transpose(step((echo((arpeggio(X) +X) ,4,6) +shuffle((transpose(transpose(step((arpeggio(X) +X) ,12) ,4) ,-5) |((transpose(step(X,12) ,-5) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,-7) ,7) ) +transpose(transpose(((transpose(X,4) +transpose(transpose(X,-7) ,4) ) +transpose(((echo(X,4,6) +(X+X) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,4) ,12) ) ) ) ) ,12) ,-7) +(step(step(((X|X) +transpose((((transpose((transpose(X,-7) +arpeggio(X) ) ,4) |transpose((step((X+X) ,12) +transpose(transpose(X,4) ,7) ) ,-7) ) |transpose(shuffle((echo(X,4,6) +transpose(shuffle(X) ,7) ) ) ,4) ) +transpose((arpeggio((arpeggio(transpose(X,-5) ) +transpose(X,-5) ) ) +transpose(echo((((X|X) +transpose(X,7) ) +transpose(X,4) ) ,4,6) ,12) ) ,4) ) ,7) ) ,12) ,12) |((shuffle((transpose(transpose((transpose((transpose(X,-7) +X) ,-5) +transpose((transpose(X,4) +shuffle(X) ) ,12) ) ,-7) ,-7) |transpose((step(transpose(X,4) ,12) +transpose(((X+transpose(X,12) ) |transpose(X,4) ) ,12) ) ,-5) ) ) +transpose((arpeggio((((transpose(X,-7) +X) +X) +transpose(shuffle(((X+transpose(((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) +transpose(((((((X+transpose(X,7) ) +transpose((X|X) ,12) ) +((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) |(X+transpose((X|X) ,12) ) ) +transpose(transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) +transpose(((X+X) |echo(X,4,6) ) ,7) ) ,12) ) ) ,7) ) ) +transpose((((transpose(((X|X) +(X+X) ) ,-5) +transpose((transpose((X+X) ,-5) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,12) ) ,-7) ) +transpose(transpose(transpose(transpose(echo(transpose(X,-5) ,4,6) ,-5) ,4) ,4) ,4) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) ,12) ) ,4) ) +transpose(((((transpose((shuffle(X) +(transpose(X,-7) +transpose(step(X,12) ,7) ) ) ,-7) |(arpeggio(X) +transpose(transpose(X,-5) ,4) ) ) +transpose(((X+X) |transpose((X+transpose(X,12) ) ,-5) ) ,12) ) +transpose((echo(transpose((((X+transpose(X,12) ) +transpose((((X+X) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,-5) ,4,6) +transpose((step(transpose(X,-7) ,12) +transpose(transpose((X+X) ,-5) ,12) ) ,12) ) ,4) ) +transpose((((echo(transpose(X,4) ,4,6) |(arpeggio(X) |(X+transpose(X,12) ) ) ) +transpose(transpose(X,4) ,7) ) +transpose(transpose((X+X) ,4) ,12) ) ,7) ) ,7) ) ) ) ,12) ) ) ) ) +transpose((((transpose(transpose(transpose(transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-5) ,-5) ,-5) ,-7) +arpeggio((((transpose(X,-7) |transpose(step(X,12) ,4) ) |(step(transpose(((X+X) +arpeggio(X) ) ,-7) ,12) |transpose(transpose(((transpose(X,-7) |X) |((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,-5) ,-5) ) ) +arpeggio((transpose(transpose(transpose(X,-7) ,-7) ,-7) +transpose(((X+X) +X) ,12) ) ) ) ) ) +transpose((((arpeggio(((transpose(transpose((arpeggio(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,4) +transpose(transpose(echo(shuffle(X) ,4,6) ,-7) ,4) ) +transpose(((transpose(X,-5) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) +arpeggio(echo(transpose(step(arpeggio(step(X,12) ) ,12) ,-7) ,4,6) ) ) |(((transpose(((X|X) +transpose((X+X) ,12) ) ,4) +transpose(transpose(transpose((X|X) ,4) ,4) ,4) ) +transpose(shuffle(X) ,7) ) |transpose((((X+transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(X,12) ) |X) ,7) ) |transpose(transpose((X+transpose((X|X) ,12) ) ,4) ,-7) ) ,-5) ) ) +transpose(transpose(transpose(transpose(echo(((transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,-7) ,-7) +transpose(((transpose((X+(X+transpose(X,7) ) ) ,-5) +transpose(X,-5) ) +transpose(transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,4) ,-5) ) ,4) ) +transpose(shuffle(shuffle((echo((transpose(X,4) +X) ,4,6) |(transpose(X,4) +transpose(shuffle(X) ,7) ) ) ) ) ,7) ) ,4,6) ,-7) ,4) ,-5) ,7) ) ,4) ) +transpose(step((((transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ,-5) +transpose(X,4) ) +transpose(step((((shuffle(X) +transpose((X+transpose(X,7) ) ,-5) ) +transpose(step((X+X) ,12) ,7) ) +transpose((X+X) ,-7) ) ,12) ,7) ) |transpose((shuffle(transpose((X+transpose(X,12) ) ,-5) ) +transpose((transpose((X+transpose(X,7) ) ,-5) +transpose((transpose(step(transpose(X,-5) ,12) ,-5) |((transpose((X+transpose(X,7) ) ,-5) +arpeggio(X) ) +transpose(step(((transpose(X,-5) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ,12) ) ) ,7) ) ,7) ) ,-5) ) ,12) ,7) ) ,-7) ) random seed used was 111511605
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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