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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: | (transpose(transpose(((transpose(((transpose(transpose(((step(arpeggio(X) ,12) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,-5) +transpose((echo(transpose(X,4) ,4,6) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,7) ) +transpose((transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,4) |transpose(shuffle(transpose(step(transpose(X,4) ,12) ,4) ) ,4) ) ,-5) ) ,-7) +transpose((((transpose(X,-7) |transpose((((X+transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) |shuffle(X) ) ,4) ) +transpose((((X+X) +transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ,12) ) +transpose(echo(((transpose(X,-5) |X) +(transpose((X+X) ,-7) +transpose((shuffle(X) |X) ,7) ) ) ,4,6) ,12) ) ,-5) ) +transpose((step(shuffle(step(step(echo(transpose(X,-7) ,4,6) ,12) ,12) ) ,12) +transpose((((arpeggio(arpeggio(echo(transpose(transpose((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,-7) ,4,6) ) ) |transpose(((X|(X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) +echo(transpose(X,-7) ,4,6) ) ,-7) ) +transpose(echo((transpose(echo((step(arpeggio(echo(X,4,6) ) ,12) +(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose((X|X) ,7) ) ) ) ,4,6) ,-5) +transpose(transpose((echo((transpose(transpose(X,-5) ,-5) +transpose((X+X) ,12) ) ,4,6) |arpeggio(step(transpose((X|X) ,-7) ,12) ) ) ,-7) ,7) ) ,4,6) ,4) ) +transpose((transpose(transpose(((((X+transpose(X,7) ) +transpose((X+transpose((X+X) ,7) ) ,12) ) +transpose(echo(arpeggio(X) ,4,6) ,12) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) ,-5) ,-5) |transpose((((arpeggio(shuffle((X|X) ) ) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) |transpose((X+transpose(X,12) ) ,-7) ) +transpose(transpose(((step((echo(X,4,6) +transpose(X,4) ) ,12) +transpose((((step(X,12) +transpose(X,4) ) +transpose(X,7) ) |transpose(step(X,12) ,-7) ) ,4) ) +transpose(transpose(transpose(transpose(X,4) ,4) ,-7) ,7) ) ,-7) ,12) ) ,-5) ) ,7) ) ,7) ) ,12) ) ,-5) ,4) +transpose(((echo(transpose((((((((transpose(transpose(transpose(X,-5) ,-7) ,-5) +transpose((X|X) ,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(transpose(transpose((echo(X,4,6) |step(echo((X+transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,12) ) ,-7) ,-5) ,-5) ,4) ) +transpose((arpeggio(step((arpeggio(transpose(X,4) ) +((((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +X) +echo(X,4,6) ) ) ,12) ) +transpose(shuffle(step(arpeggio(transpose(echo(step(X,12) ,4,6) ,4) ) ,12) ) ,4) ) ,7) ) +transpose(arpeggio(((echo(transpose((((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose((X+X) ,7) ) +transpose(transpose(X,4) ,7) ) ,-7) ,4,6) +transpose(transpose(transpose(arpeggio(X) ,-5) ,-5) ,4) ) +transpose(echo(transpose(transpose(X,-5) ,4) ,4,6) ,7) ) ) ,12) ) +transpose(arpeggio(((transpose(echo((echo(X,4,6) +transpose((transpose(X,-7) |(X|(X+X) ) ) ,7) ) ,4,6) ,-7) +transpose((((transpose(X,-7) +transpose((X+transpose(X,7) ) ,12) ) +arpeggio((X+transpose(X,12) ) ) ) +transpose((echo((X+transpose(X,12) ) ,4,6) +transpose((transpose(X,4) +X) ,7) ) ,7) ) ,7) ) +arpeggio(transpose(transpose((X+transpose(arpeggio(X) ,7) ) ,-7) ,-7) ) ) ) ,7) ) +transpose(transpose(((transpose((X|transpose((X+transpose(X,12) ) ,4) ) ,4) |transpose(transpose(step(transpose(echo(X,4,6) ,4) ,12) ,-7) ,-5) ) +((transpose(arpeggio((X+X) ) ,-7) +(((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose(transpose(((((X+X) +transpose((X|X) ,4) ) +transpose(X,7) ) +transpose(((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,-7) ,7) ) ) |shuffle((arpeggio((X|X) ) |(step(X,12) +echo(X,4,6) ) ) ) ) ) ,4) ,12) ) ,-5) ,4,6) +((((transpose(echo((transpose(step(X,12) ,-5) |(transpose(X,-7) +transpose((X|X) ,12) ) ) ,4,6) ,4) +transpose((transpose((transpose(X,4) |X) ,-7) +(shuffle(transpose(transpose(X,-5) ,-7) ) +transpose(X,-7) ) ) ,12) ) +transpose(shuffle((step(step(arpeggio(X) ,12) ,12) |((X+transpose(echo(X,4,6) ,7) ) |arpeggio(X) ) ) ) ,4) ) +transpose((shuffle((step(X,12) +(transpose(X,-7) +transpose(X,12) ) ) ) +transpose(echo(((step((X+X) ,12) +transpose(X,-5) ) |step(echo(transpose(transpose(X,-5) ,4) ,4,6) ,12) ) ,4,6) ,12) ) ,7) ) +echo((((transpose(transpose(X,4) ,-5) +transpose(transpose(transpose((((X+transpose(X,12) ) +transpose((X+X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,4) ,12) ) +transpose((((X+transpose(echo(X,4,6) ,7) ) +transpose(((X+X) +echo(X,4,6) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,7) ) ,4,6) ) ) |echo((((transpose(transpose(((transpose(transpose(arpeggio(transpose(arpeggio((X+X) ) ,4) ) ,-7) ,-5) +transpose(((arpeggio(transpose(transpose(X,-7) ,-7) ) +transpose(transpose(echo(echo(X,4,6) ,4,6) ,4) ,4) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,7) ) ,7) ) +transpose((step(transpose(transpose(shuffle(arpeggio(X) ) ,4) ,-5) ,12) +transpose(shuffle((transpose(shuffle(X) ,-7) +transpose(shuffle((X+transpose(X,12) ) ) ,12) ) ) ,-7) ) ,12) ) ,4) ,4) +transpose(step(arpeggio(arpeggio(shuffle((((shuffle(X) +transpose(transpose(transpose(X,4) ,-7) ,12) ) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose(shuffle(((X+(X|X) ) |step(transpose(X,-5) ,12) ) ) ,12) ) ) ) ) ,12) ,7) ) |shuffle((((transpose(X,4) +((X+transpose(X,12) ) +(X+X) ) ) +((X+transpose(transpose(shuffle(X) ,4) ,7) ) +(transpose(arpeggio(X) ,4) +transpose(transpose(X,4) ,7) ) ) ) +transpose(transpose(transpose(transpose(transpose(X,-7) ,4) ,-5) ,-7) ,12) ) ) ) +transpose(step(((step((((transpose(X,-5) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) +transpose(arpeggio((X+X) ) ,4) ) +transpose(step(step(X,12) ,12) ,7) ) ,12) |step((arpeggio((((X+X) |(X+transpose(X,12) ) ) +X) ) |(((step(X,12) +X) |transpose((X+transpose(X,7) ) ,4) ) +transpose((X+X) ,4) ) ) ,12) ) +transpose(((((echo(X,4,6) +arpeggio(((X+X) |X) ) ) +transpose(transpose((X+transpose(step(X,12) ,12) ) ,4) ,7) ) |transpose((transpose(X,4) +(((X|X) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) ,4) ) +(arpeggio(transpose(X,-7) ) +(X+transpose(transpose(X,-7) ,-7) ) ) ) ,7) ) ,12) ,7) ) ,4,6) ) ,7) ) random seed used was 225852379
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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