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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 18 generations the expression "X" became this: | (step((((arpeggio(step(transpose(transpose((X+((transpose(X,-5) +X) +transpose(transpose(X,-7) ,7) ) ) ,4) ,-7) ,12) ) +transpose(shuffle(echo(transpose(transpose((step(X,12) |shuffle(X) ) ,-5) ,4) ,4,6) ) ,12) ) |echo((((transpose(echo(arpeggio(echo(transpose(X,4) ,4,6) ) ,4,6) ,-7) +transpose(step(transpose((transpose(shuffle((X+transpose((X|X) ,7) ) ) ,-5) +(transpose((shuffle(X) |transpose(X,-7) ) ,4) +transpose(X,4) ) ) ,-7) ,12) ,4) ) +transpose((transpose(transpose((transpose(((X+transpose(X,12) ) |transpose(X,-7) ) ,-7) +transpose(arpeggio((X|X) ) ,12) ) ,4) ,-7) |transpose((X+(echo(X,4,6) |arpeggio(X) ) ) ,-7) ) ,7) ) +transpose(shuffle(((((transpose(X,4) +(X+transpose(X,12) ) ) +transpose(transpose((X+step(X,12) ) ,-7) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) |transpose(transpose(X,4) ,4) ) ) ,4) ) ,4,6) ) |((((transpose(transpose(((transpose((((X|X) +shuffle(transpose(X,4) ) ) |step(X,12) ) ,-5) +transpose((transpose((transpose(transpose(X,-5) ,4) +transpose(X,7) ) ,4) |arpeggio(X) ) ,4) ) +transpose(step(transpose(transpose(arpeggio(X) ,-7) ,4) ,12) ,7) ) ,-5) ,4) +transpose(transpose(echo(shuffle(echo(transpose(X,-5) ,4,6) ) ,4,6) ,-5) ,4) ) +transpose(((echo((transpose(transpose((step(arpeggio(X) ,12) +transpose(transpose((X|X) ,-7) ,7) ) ,-5) ,-7) +transpose(step(((transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) +(transpose((X+transpose(X,12) ) ,4) +((transpose(X,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) ) |(transpose(step(X,12) ,4) +(transpose((X|X) ,-7) +transpose((X+X) ,4) ) ) ) ,12) ,12) ) ,4,6) |((((X+transpose(X,12) ) +transpose(transpose(((transpose(step(X,12) ,4) +transpose(transpose(X,-5) ,12) ) +transpose(transpose(X,-7) ,4) ) ,-7) ,7) ) |(((echo(transpose(X,4) ,4,6) +transpose((((X+(X+transpose(X,12) ) ) +transpose(step((X+transpose(X,7) ) ,12) ,12) ) |transpose(X,-5) ) ,4) ) +transpose(transpose((transpose(X,-5) +transpose(shuffle(X) ,12) ) ,4) ,7) ) |((X+X) +transpose((transpose((X+X) ,4) +transpose(step(X,12) ,7) ) ,7) ) ) ) |transpose((((shuffle(transpose(X,4) ) +(X|(X+X) ) ) +transpose(shuffle(transpose(X,-7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) ) ) |arpeggio(echo(echo(transpose(X,-5) ,4,6) ,4,6) ) ) ,7) ) +transpose(transpose(transpose(echo(transpose(shuffle((transpose(((X+X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) +((X+transpose(arpeggio((X+X) ) ,12) ) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ) ) ,4) ,4,6) ,4) ,-7) ,7) ) |((((echo((transpose((transpose(X,4) +transpose(echo(X,4,6) ,4) ) ,-5) +transpose(step((X+X) ,12) ,4) ) ,4,6) +transpose(step(echo(((X|X) +transpose((X|X) ,12) ) ,4,6) ,12) ,-7) ) +transpose(shuffle((shuffle(X) +transpose(((transpose(arpeggio(X) ,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(arpeggio(shuffle(X) ) ,7) ) ,-5) ) ) ,7) ) |((shuffle(arpeggio(echo(((transpose(((X|X) +transpose(X,-5) ) ,4) +transpose(transpose(X,-5) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,4,6) ) ) +transpose(step((transpose(shuffle(echo(transpose(X,-5) ,4,6) ) ,-5) |arpeggio(echo(transpose((step(transpose(X,4) ,12) |X) ,-5) ,4,6) ) ) ,12) ,4) ) +transpose(transpose(transpose(((((transpose(transpose(X,-7) ,4) |((X+X) +transpose(X,12) ) ) +transpose(((((((X+transpose(X,12) ) +X) +transpose((X+X) ,4) ) +transpose(arpeggio(X) ,7) ) +transpose((transpose(transpose(X,-5) ,-5) +transpose(((X+transpose(X,7) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4) ) +transpose(echo((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ,4) ) +transpose(arpeggio((transpose(X,-5) +arpeggio(X) ) ) ,7) ) |transpose(transpose(((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,-5) ) ,-5) ,-7) ,7) ) ) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,4) ,-5) ) ) ) ,12) |transpose(transpose((((((transpose(step(((X+((X+transpose(X,12) ) +transpose(X,7) ) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,12) ,-7) +transpose(arpeggio(((((X+X) |transpose(X,4) ) +transpose((transpose(echo(X,4,6) ,4) +transpose(transpose((X|X) ,-5) ,7) ) ,4) ) +transpose(((X+echo(X,4,6) ) +transpose(transpose(X,4) ,7) ) ,7) ) ) ,-7) ) +shuffle((step(transpose(X,-5) ,12) +(((X|X) +X) |((transpose(X,-5) |transpose(X,-7) ) +transpose((transpose(X,4) +transpose(X,7) ) ,12) ) ) ) ) ) |(echo(step(((((X|X) +transpose(transpose(X,-5) ,12) ) +transpose((X|X) ,4) ) |shuffle((echo(X,4,6) +transpose(step(X,12) ,7) ) ) ) ,12) ,4,6) |transpose((shuffle((X+transpose(transpose(X,-5) ,12) ) ) +transpose((transpose((X|X) ,-7) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,7) ) ,4) ) ) +transpose(((transpose(transpose(transpose(echo(transpose((X+transpose(X,7) ) ,-7) ,4,6) ,4) ,-5) ,-5) +transpose(arpeggio((transpose((X+transpose(transpose(X,-5) ,12) ) ,4) |(transpose((X|X) ,-7) +transpose(arpeggio((X+transpose((X+X) ,7) ) ) ,12) ) ) ) ,4) ) +transpose(arpeggio(transpose(step(transpose((X+transpose(X,7) ) ,-5) ,12) ,-7) ) ,7) ) ,12) ) +transpose(transpose(transpose(transpose((shuffle(((arpeggio(transpose((X+X) ,4) ) +transpose((transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +X) |(X+transpose(X,12) ) ) ,4) ,-5) +transpose((transpose(X,-7) +(transpose(X,4) +transpose(X,-5) ) ) ,12) ) ,4) ) +transpose(transpose(step((shuffle(transpose(X,4) ) |transpose(X,4) ) ,12) ,4) ,7) ) ) +(((transpose((X+(X+transpose(X,7) ) ) ,-7) +transpose(((arpeggio(X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose((arpeggio(X) |((X+transpose(X,12) ) +(X+transpose(X,12) ) ) ) ,-5) ) +(((X+transpose(X,12) ) +X) +echo(X,4,6) ) ) ) ,-5) ,4) ,-7) ,12) ) ,4) ,4) ) random seed used was 246224406
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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