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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((transpose(transpose(((((arpeggio((step(X,12) +transpose(echo(X,4,6) ,12) ) ) +transpose(echo((transpose(transpose(X,4) ,-7) +transpose(transpose(X,-7) ,12) ) ,4,6) ,4) ) +transpose((transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) |shuffle(X) ) ,7) ) +transpose(transpose(((transpose(X,-7) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,4) ,7) ) ,-7) ,4) ) +transpose(shuffle((step(transpose(arpeggio(transpose(X,-7) ) ,-7) ,12) +transpose((transpose(shuffle(transpose((arpeggio(X) |X) ,4) ) ,-7) +((step(X,12) |X) +transpose(arpeggio((transpose(step(X,12) ,-5) |((X+transpose(X,7) ) +X) ) ) ,7) ) ) ,12) ) ) ,7) ) ,-7) ,4) +transpose(shuffle(step(step((transpose((X+transpose(X,7) ) ,4) +transpose((((step(X,12) |X) |transpose(X,-5) ) +transpose((transpose(X,-7) +X) ,12) ) ,7) ) ,12) ,12) ) ,7) ) ,-5) random seed used was 5
EXPR = (transpose((arpeggio((((transpose(X,-5) +transpose((((transpose(arpeggio(X) ,-7) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +(X+(transpose(X,-5) +transpose(X,7) ) ) ) ,12) ) |arpeggio((transpose(X,-7) +(echo(transpose(X,4) ,4,6) +transpose(X,7) ) ) ) ) |(((echo(((X+transpose(X,7) ) +(transpose((X+X) ,4) |X) ) ,4,6) +transpose(step((transpose(X,-5) +transpose(((X+X) +X) ,12) ) ,12) ,4) ) +transpose(transpose(((echo(X,4,6) |(X+transpose(X,12) ) ) |(X|transpose(X,-7) ) ) ,4) ,7) ) +transpose((echo(X,4,6) +((X+transpose(X,12) ) +((X+X) +transpose(transpose((X|X) ,-5) ,7) ) ) ) ,7) ) ) ) +transpose(transpose(((((transpose(transpose(X,-7) ,-7) +transpose((echo(X,4,6) +transpose(transpose((echo(X,4,6) +transpose(X,4) ) ,-5) ,7) ) ,-5) ) |arpeggio((((step(X,12) +transpose(X,4) ) +transpose(X,7) ) +step((X+transpose(X,12) ) ,12) ) ) ) +transpose(arpeggio(transpose(echo(shuffle(X) ,4,6) ,-5) ) ,4) ) +transpose(transpose(arpeggio((step(X,12) +transpose(arpeggio(((X+X) +transpose(X,12) ) ) ,12) ) ) ,-5) ,7) ) ,-5) ,7) ) ,4) +transpose(transpose(transpose(((transpose(transpose(echo(transpose(transpose(transpose(X,4) ,-5) ,-7) ,4,6) ,-5) ,4) +transpose(transpose((transpose((shuffle(((transpose(X,-5) +transpose((X|transpose(X,4) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) +transpose(transpose((shuffle((X+transpose(X,12) ) ) +transpose(arpeggio(X) ,12) ) ,-5) ,12) ) ,-5) +transpose((((transpose(X,-7) +transpose(arpeggio(X) ,4) ) +transpose((X+X) ,7) ) +((step(transpose((X+X) ,-7) ,12) |((X+X) +transpose((X|X) ,12) ) ) +transpose(echo(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4,6) ,7) ) ) ,7) ) ,-5) ,4) ) +transpose((arpeggio(transpose((step(echo(X,4,6) ,12) +transpose((((X+X) +transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,4) ) +transpose((((transpose(transpose(transpose(transpose(transpose(shuffle(X) ,-5) ,-7) ,-7) ,-5) ,-7) +transpose(((((X|X) +(X|X) ) |transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose(transpose(transpose(transpose(transpose(X,4) ,-5) ,-7) ,-7) ,12) ) ,-7) ) +transpose(arpeggio(step((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(X,-5) ) ,12) ) ,4) ) +transpose(transpose(transpose(echo(arpeggio(step(X,12) ) ,4,6) ,4) ,-7) ,7) ) ,12) ) ,7) ) ,-7) ,4) ,7) ) random seed used was 0
EXPR = ((transpose(((shuffle(echo(arpeggio((X+X) ) ,4,6) ) +transpose(transpose(transpose(transpose(X,4) ,-7) ,4) ,7) ) +transpose((transpose((arpeggio(transpose(X,-7) ) +transpose(transpose((X+transpose((X+X) ,7) ) ,-5) ,4) ) ,4) |echo(echo((shuffle((X+transpose(X,7) ) ) +transpose((shuffle(X) +(X|X) ) ,7) ) ,4,6) ,4,6) ) ,7) ) ,-5) +transpose((transpose(((shuffle(X) +transpose((((X+(X+X) ) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(X,7) ) ,7) ) |shuffle(((X+(X+X) ) +transpose(((X+transpose(X,7) ) +arpeggio(X) ) ,7) ) ) ) ,-5) |((((echo(X,4,6) +echo(X,4,6) ) |X) |((transpose(X,-5) +transpose(transpose(X,4) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) ) |(((((transpose(X,-5) |transpose(X,4) ) +transpose(shuffle(transpose(X,-7) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) +transpose(((X+transpose((X+X) ,12) ) +(X|step(X,12) ) ) ,4) ) +transpose(transpose(shuffle((transpose(X,4) +X) ) ,-7) ,7) ) ) ) ,4) ) +transpose(((transpose((arpeggio(shuffle(X) ) +(transpose((step((X+transpose(X,12) ) ,12) +transpose(arpeggio(transpose(X,-5) ) ,12) ) ,-7) +transpose(transpose(arpeggio(transpose(X,-5) ) ,4) ,7) ) ) ,4) +((((((transpose(transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) ,4) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(((arpeggio(X) +transpose(arpeggio(X) ,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,7) ) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) +transpose(((step(X,12) |((X+transpose(X,7) ) +step(X,12) ) ) |transpose(transpose(echo(X,4,6) ,-5) ,-7) ) ,7) ) |((((arpeggio(shuffle(transpose(X,4) ) ) +transpose(echo(transpose(transpose(X,-7) ,-5) ,4,6) ,12) ) +((((((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) +transpose(((X|X) |(X|X) ) ,12) ) |echo(X,4,6) ) |transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) |step(X,12) ) ,-5) ) ) +transpose(shuffle((transpose(transpose(echo((((X+transpose(X,12) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4,6) ,-7) ,-7) +transpose((((X+transpose(arpeggio(X) ,7) ) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose(echo(((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) ,7) ) ,-5) ) ) ,4) ) +transpose(shuffle(echo(shuffle(step(X,12) ) ,4,6) ) ,7) ) ) ) +transpose(transpose(((transpose(transpose(transpose(transpose(X,-5) ,4) ,-5) ,4) +transpose(transpose(X,4) ,-5) ) +transpose(step((transpose(X,-7) |(X+transpose(X,12) ) ) ,12) ,-5) ) ,-5) ,12) ) ,7) ) random seed used was 0
EXPR = (((step((transpose(transpose((transpose(transpose(X,-7) ,-7) |((X+transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ) ,-7) ,-5) |transpose(step((transpose(shuffle((X+arpeggio((X+X) ) ) ) ,-5) |((((X|X) +X) +transpose(transpose(X,4) ,12) ) +transpose(shuffle(step(step(transpose(X,-5) ,12) ,12) ) ,12) ) ) ,12) ,4) ) ,12) +transpose(shuffle(step(arpeggio(((echo(X,4,6) +transpose(X,7) ) +arpeggio(X) ) ) ,12) ) ,4) ) +transpose(transpose(((echo(transpose(transpose(((X+transpose(X,7) ) +X) ,-5) ,-7) ,4,6) |step((echo(transpose(X,-5) ,4,6) +transpose(((((transpose(X,-5) |X) +transpose((X+X) ,12) ) +transpose(transpose((((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) +transpose(X,12) ) ,-5) ,4) ) +transpose(transpose((echo(step(X,12) ,4,6) +X) ,-5) ,7) ) ,7) ) ,12) ) |((echo((((transpose(echo(X,4,6) ,4) +transpose(transpose(X,-5) ,7) ) +transpose((transpose(X,-7) |transpose(X,4) ) ,4) ) +transpose(arpeggio(transpose(X,-5) ) ,4) ) ,4,6) |arpeggio((echo(X,4,6) |step(shuffle(X) ,12) ) ) ) +transpose(step(shuffle((((X|X) |(((X+X) +transpose((X+X) ,4) ) +transpose((X+X) ,7) ) ) +transpose(((arpeggio(X) +transpose(transpose(X,-7) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) ,12) ,12) ) ) ,-7) ,7) ) +transpose(shuffle((step((arpeggio(transpose((X|(X+transpose(X,7) ) ) ,-7) ) +transpose(transpose((((((X+X) +transpose(X,12) ) +transpose(transpose(X,-7) ,-7) ) +transpose(((transpose(X,-7) +X) +(echo(X,4,6) |X) ) ,4) ) +transpose((step(X,12) |(X|X) ) ,7) ) ,-5) ,7) ) ,12) |transpose(transpose((arpeggio(transpose(((step(X,12) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) |transpose((((transpose(X,-5) +transpose(X,-5) ) +transpose(step(X,12) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ) ,4) ,-7) ) ) ,7) ) random seed used was 0
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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