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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 12 generations the expression "X" became this: | (((shuffle(transpose((((X+transpose(X,12) ) +transpose(X,12) ) |transpose(X,4) ) ,4) ) |((shuffle((step(echo((arpeggio(X) +transpose(arpeggio(X) ,7) ) ,4,6) ,12) +transpose((transpose((X+X) ,-5) |transpose(echo(transpose(X,-5) ,4,6) ,-7) ) ,12) ) ) +(echo(X,4,6) +transpose((transpose(X,-7) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,7) ) ) |arpeggio(((X|transpose((X+transpose(X,12) ) ,-5) ) +transpose((arpeggio((X+transpose((X+transpose(X,4) ) ,12) ) ) |(transpose(X,-7) |X) ) ,7) ) ) ) ) +transpose(((arpeggio(X) |((X+transpose(X,12) ) +transpose(X,7) ) ) +transpose(transpose(((((step(shuffle(X) ,12) +transpose(X,4) ) +transpose((X+X) ,7) ) |shuffle(echo(X,4,6) ) ) |echo(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose((echo(X,4,6) |transpose(X,-5) ) ,7) ) ,4,6) ) ,4) ,12) ) ,4) ) +transpose(step(transpose(step(((transpose(arpeggio(X) ,4) +transpose(transpose(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) ,4) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) ,12) ,-5) ,12) ,7) ) random seed used was 149859182
EXPR = (transpose(transpose(transpose(((((step(X,12) +transpose(echo(X,4,6) ,12) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) |echo(transpose(transpose(transpose(X,-5) ,-7) ,4) ,4,6) ) +transpose((X+X) ,12) ) ,-7) ,4) ,-7) +transpose(((step(shuffle(((arpeggio(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,4,6) ) +transpose((((((X+transpose(X,7) ) +(X+X) ) +transpose(transpose(X,-7) ,12) ) +transpose(echo(step(transpose(X,4) ,12) ,4,6) ,4) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose(transpose(transpose((X|X) ,-7) ,4) ,7) ) ) ,12) +transpose((transpose((transpose(transpose(X,-7) ,4) +(((step(shuffle(X) ,12) +(arpeggio(X) |transpose(X,-5) ) ) |(transpose(X,4) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose((X+X) ,7) ) ,12) ) ) +((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) +(X|(X|X) ) ) ) ) ,-5) +transpose(arpeggio((step(((X|X) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +arpeggio(X) ) +step((X+X) ,12) ) ,12) ) ,12) +transpose((transpose(arpeggio((X+transpose(X,12) ) ) ,4) +transpose(((arpeggio(X) +(step(X,12) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) ) +(((X+transpose(transpose(transpose(X,4) ,4) ,12) ) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,12) ) ,12) ) ) ,12) ) ,7) ) +(((arpeggio(transpose(transpose(X,4) ,4) ) +transpose((echo(shuffle(X) ,4,6) +echo(echo(X,4,6) ,4,6) ) ,12) ) |transpose((shuffle(echo(transpose(X,-7) ,4,6) ) |(((X|X) +(X|X) ) +transpose((transpose(X,-7) +(X|X) ) ,7) ) ) ,-7) ) +transpose((((transpose(((step((X|X) ,12) +transpose(X,4) ) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) ,7) ) ,4) +(step(echo(X,4,6) ,12) |((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ) ) +transpose((((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) ,4) +((((transpose(X,-5) +transpose(arpeggio(transpose((X|X) ,-5) ) ,4) ) +transpose(((transpose(transpose(X,4) ,4) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,7) ) |transpose(transpose(echo(X,4,6) ,4) ,-7) ) |transpose((X+transpose((X|(X+X) ) ,7) ) ,-7) ) ) +transpose(((transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) +transpose((X|transpose(X,-5) ) ,4) ) +transpose(shuffle(transpose(transpose((X|X) ,-5) ,-5) ) ,7) ) ,4) ) +transpose(((transpose(X,4) +transpose(transpose(transpose((step(X,12) +transpose(shuffle(X) ,12) ) ,-5) ,-7) ,4) ) +transpose(echo(transpose(transpose(transpose(arpeggio(X) ,4) ,-7) ,-5) ,4,6) ,7) ) ,7) ) ,4) ) +transpose(transpose(transpose((echo(transpose(X,4) ,4,6) +transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) +(transpose(X,-5) +transpose(X,12) ) ) ,12) ) ,4) ,4) ,7) ) ,7) ) ) ,7) ) random seed used was 0
EXPR = ((step(((transpose(step(((((transpose(X,-5) +transpose(step(X,12) ,4) ) +transpose(X,7) ) +(X+transpose(X,-5) ) ) |echo(X,4,6) ) ,12) ,-7) +transpose(((transpose(((((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(X,4) ) +transpose(((X|X) +transpose(X,12) ) ,7) ) ,-5) +transpose((step((step(X,12) +transpose(X,12) ) ,12) +(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) |(X+transpose(X,12) ) ) ) ,7) ) +transpose((transpose(shuffle((((((X+X) |shuffle(X) ) +(X+X) ) +transpose((transpose(X,4) +transpose(X,-7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,-5) +transpose(step(transpose((((X|X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,-5) ) ,7) ) ,-7) ,12) ,7) ) ,12) ) ,4) ) +transpose(((((transpose((X+transpose(((X+transpose(X,7) ) |X) ,7) ) ,4) +transpose(echo(transpose(transpose(transpose(X,-7) ,4) ,4) ,4,6) ,12) ) |(echo(transpose(echo((X|X) ,4,6) ,4) ,4,6) +echo(X,4,6) ) ) +transpose(((((((step(X,12) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(transpose((X+X) ,-7) ,7) ) +transpose((((echo(X,4,6) +transpose(((transpose(X,4) |X) +transpose(((X|X) |X) ,7) ) ,4) ) +transpose((shuffle(transpose(X,-5) ) |transpose((X|X) ,4) ) ,7) ) |transpose(step((X+transpose(X,12) ) ,12) ,4) ) ,4) ) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,4) ,7) ) +transpose(((echo(((X|X) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |echo(X,4,6) ) ,7) ) ,4,6) +transpose(echo(transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,4,6) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,4) ,7) ) ,-7) ) ,4) ) +transpose(shuffle((((arpeggio(X) +transpose(X,12) ) +transpose(((X+transpose(X,7) ) +transpose(X,-5) ) ,12) ) |(transpose(X,-5) +X) ) ) ,7) ) ,7) ) ,12) +transpose((((shuffle(((transpose(X,4) +(X+X) ) +transpose(transpose(transpose(transpose(X,-7) ,4) ,4) ,12) ) ) +transpose(((shuffle((X+X) ) +transpose((step(X,12) +transpose(transpose(X,4) ,7) ) ,12) ) +transpose(transpose((X+(X+X) ) ,-5) ,4) ) ,4) ) +transpose(((transpose(transpose(((X+shuffle(X) ) +arpeggio(echo(X,4,6) ) ) ,-5) ,-5) +transpose((X+transpose(transpose(X,4) ,7) ) ,4) ) |transpose(shuffle((transpose(transpose(X,-5) ,4) |(X+transpose(X,7) ) ) ) ,-5) ) ,7) ) +step(transpose((transpose((((X|X) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+(X+transpose(X,12) ) ) ,7) ) ,-5) +transpose((((transpose(X,4) +transpose(X,12) ) +transpose((X+X) ,4) ) +(transpose(X,4) +transpose(arpeggio(((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,12) ) ) ,12) ) ,4) ,12) ) ,4) ) +transpose(echo((((transpose(echo(transpose(transpose(X,4) ,4) ,4,6) ,-5) +transpose((((echo((X|X) ,4,6) +transpose(transpose(transpose(X,-5) ,-7) ,7) ) +(echo(X,4,6) +arpeggio(X) ) ) +step(transpose((X+transpose(X,7) ) ,-7) ,12) ) ,4) ) +transpose((transpose((transpose(X,-5) |X) ,4) |(((shuffle(X) +transpose(transpose(((shuffle(shuffle(X) ) +transpose(X,4) ) +transpose((X+transpose(X,4) ) ,7) ) ,4) ,4) ) +transpose(transpose((((X+transpose(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,-7) ,7) ) +shuffle(transpose(X,4) ) ) ) ,7) ) +shuffle((transpose((arpeggio(X) |arpeggio(transpose(transpose(X,4) ,-5) ) ) ,4) +transpose(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ,7) ) ) ) ,4,6) ,7) ) random seed used was 0
EXPR = step((((transpose(X,-7) +transpose((transpose(((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((transpose(X,4) +(X|X) ) ,4) ) +transpose(transpose(step(X,12) ,-7) ,7) ) ,-5) |transpose(transpose(((X+X) +transpose(X,7) ) ,-5) ,-7) ) ,7) ) +transpose(((arpeggio(transpose(arpeggio(X) ,-5) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-5) ,7) ) +transpose(arpeggio((step(transpose((X+transpose(X,12) ) ,-5) ,12) +transpose(echo((((X+X) +transpose(transpose(X,4) ,4) ) +transpose((transpose(X,-7) +transpose(arpeggio(X) ,12) ) ,7) ) ,4,6) ,7) ) ) ,12) ) ,7) ) +(transpose(transpose(echo(X,4,6) ,-5) ,-5) |transpose(step(transpose(((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ,12) ,4) ) ) ,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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