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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: | (arpeggio((shuffle(transpose((step(transpose((shuffle(X) |step(transpose(X,-5) ,12) ) ,-5) ,12) +transpose(echo((transpose(step(X,12) ,-5) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(transpose(X,-5) ,7) ) ,7) ) ,4,6) ,7) ) ,-5) ) +transpose(transpose(transpose(echo(shuffle(transpose(X,-7) ) ,4,6) ,-5) ,4) ,12) ) ) +transpose((((transpose(((step(step(step((X+transpose(X,12) ) ,12) ,12) ,12) +transpose(echo(transpose(shuffle(shuffle(X) ) ,-5) ,4,6) ,4) ) +transpose((((arpeggio((X+transpose(X,7) ) ) +transpose(transpose(X,-5) ,4) ) +transpose(step(X,12) ,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,7) ) ,-7) |step(echo(transpose(transpose(shuffle((X|X) ) ,-7) ,-5) ,4,6) ,12) ) +transpose(((transpose(step(step(echo(X,4,6) ,12) ,12) ,-5) +transpose(shuffle(shuffle(echo(X,4,6) ) ) ,7) ) +transpose(transpose(echo((arpeggio(transpose(X,-7) ) +echo(shuffle(step(X,12) ) ,4,6) ) ,4,6) ,4) ,12) ) ,4) ) +transpose((((((transpose(arpeggio(transpose(X,-7) ) ,-5) |echo(X,4,6) ) +transpose(arpeggio(arpeggio(transpose(transpose(X,-7) ,4) ) ) ,4) ) +transpose((transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) ) +(((X+transpose(X,12) ) +(X|X) ) +transpose(transpose(step(X,12) ,4) ,7) ) ) ,-5) +transpose(transpose(((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,-5) ,7) ) ,7) ) +transpose((shuffle(transpose((transpose(X,-5) +transpose(transpose(X,4) ,12) ) ,-5) ) |((transpose(arpeggio(transpose((X+transpose(X,7) ) ,-7) ) ,-5) +transpose(transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-7) ,4) ) +transpose(transpose((shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) ,-7) ,7) ) ) ,4) ) +transpose(echo(transpose(step((transpose(transpose(echo(X,4,6) ,-5) ,4) |step(X,12) ) ,12) ,-7) ,4,6) ,7) ) ,7) ) ,12) ) random seed used was 576123
EXPR = ((((transpose(transpose(step(X,12) ,4) ,4) +transpose(shuffle(transpose((X+transpose(X,7) ) ,-5) ) ,12) ) |arpeggio((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) +(transpose(X,-5) +transpose((X+transpose(X,7) ) ,7) ) ) ) ) +transpose(arpeggio(transpose(step(arpeggio(arpeggio(X) ) ,12) ,-5) ) ,4) ) +transpose(transpose((shuffle(transpose(shuffle(transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-7) ,4) ) ,-5) ) +transpose(transpose(step((X+transpose(X,12) ) ,12) ,4) ,12) ) ,-5) ,7) ) random seed used was 0
EXPR = (transpose(transpose(transpose(((transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(shuffle(shuffle((X+transpose(X,7) ) ) ) ,12) ) ,-5) +transpose(transpose(transpose(step(transpose(((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ,-7) ,12) ,-7) ,-5) ,4) ) +transpose((arpeggio(transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,4) ) +transpose(((transpose(X,-5) +transpose(shuffle(X) ,12) ) |((transpose(transpose(X,-5) ,-5) +transpose(transpose(X,-7) ,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ) ,12) ) ,7) ) ,4) ,-7) ,4) +transpose(transpose(((transpose((((transpose(arpeggio(transpose(X,-5) ) ,4) +transpose(((transpose(X,-5) |(X+transpose(X,7) ) ) +((X+X) +transpose((X+transpose(X,12) ) ,7) ) ) ,7) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,-5) ,4) ) +transpose((((arpeggio(X) +transpose(echo(X,4,6) ,4) ) +transpose(shuffle(X) ,7) ) +echo(X,4,6) ) ,7) ) ,-5) +transpose(((echo(arpeggio(transpose(transpose((X+X) ,-5) ,-7) ) ,4,6) +transpose((((transpose((((step((transpose(X,-5) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,12) |(transpose(X,-5) |transpose(step(transpose(X,-5) ,12) ,-5) ) ) +transpose((transpose(X,-5) +transpose((transpose(X,-5) +transpose((X+X) ,7) ) ,7) ) ,4) ) +transpose(((echo(X,4,6) +X) +transpose(transpose(X,4) ,-5) ) ,7) ) ,-5) +transpose(step(step(step(arpeggio(X) ,12) ,12) ,12) ,4) ) +transpose(transpose((transpose((echo(X,4,6) +transpose(X,7) ) ,-7) +echo(transpose(echo(transpose(X,-5) ,4,6) ,-7) ,4,6) ) ,-7) ,7) ) +transpose((transpose(echo((transpose(step(X,12) ,-5) |echo(X,4,6) ) ,4,6) ,-5) +transpose(transpose((step((step(shuffle((X+transpose(X,7) ) ) ,12) +transpose(((echo(X,4,6) +transpose(arpeggio(X) ,7) ) +step(X,12) ) ,12) ) ,12) |(transpose(X,-7) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ) ,-7) ,12) ) ,7) ) ,4) ) +transpose((shuffle(shuffle(transpose(arpeggio(((step((transpose(X,4) +transpose(X,12) ) ,12) +transpose(transpose((X+X) ,-5) ,4) ) +transpose((transpose(X,4) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) ,-5) ) ) |arpeggio(shuffle((shuffle(transpose(X,-5) ) +transpose((transpose(X,-5) +transpose(transpose(transpose((transpose(X,4) +transpose(transpose(X,-5) ,12) ) ,-5) ,-7) ,12) ) ,7) ) ) ) ) ,7) ) ,4) ) +transpose(transpose(((echo(transpose((step(transpose((((X+transpose(transpose(X,-5) ,12) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose(step(echo(X,4,6) ,12) ,7) ) ,-7) ,12) +transpose(transpose(transpose(shuffle((step(X,12) +transpose(X,-7) ) ) ,-7) ,-5) ,7) ) ,-7) ,4,6) +transpose(((shuffle((transpose((transpose(X,-5) |step(transpose(transpose(X,4) ,-7) ,12) ) ,-5) |arpeggio(echo(transpose(X,-7) ,4,6) ) ) ) +transpose(transpose(arpeggio((((echo(((transpose(X,4) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,4,6) +transpose(shuffle(transpose(transpose(X,-7) ,-7) ) ,7) ) +transpose((transpose(transpose(echo(X,4,6) ,-7) ,-5) +transpose(transpose((X+transpose(transpose((X|X) ,-5) ,7) ) ,-5) ,7) ) ,4) ) +transpose(arpeggio(transpose((transpose(X,-7) +transpose(X,7) ) ,-7) ) ,7) ) ) ,-7) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ,4) ) +transpose(step(((((arpeggio((((X+transpose(X,12) ) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ) +step(step(((X+transpose(X,12) ) +transpose(X,12) ) ,12) ,12) ) +step(X,12) ) +transpose((X|transpose((X+transpose(X,7) ) ,-5) ) ,12) ) +transpose(transpose(((((X|(X+X) ) +transpose((X+transpose(X,7) ) ,12) ) +transpose((transpose((X|X) ,-5) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,4) ) +transpose(transpose((X|(X+X) ) ,-5) ,7) ) ,-5) ,12) ) ,12) ,7) ) ,-7) ,7) ) ,-5) ,12) ) 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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