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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 13 generations the expression "X" became this: | ((((transpose(arpeggio((X|((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,-7) +transpose(((transpose(X,-7) +transpose(transpose(arpeggio((X|X) ) ,-5) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,4) ) +transpose((transpose((transpose(X,-5) +X) ,-5) +transpose((transpose(transpose(X,-7) ,-5) |transpose(transpose(X,4) ,4) ) ,12) ) ,7) ) +transpose((transpose(((transpose(transpose(((X+transpose(echo(X,4,6) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ,4) +transpose(shuffle(X) ,4) ) +transpose(step(arpeggio(echo(transpose((X|X) ,4) ,4,6) ) ,12) ,7) ) ,-5) +transpose((((transpose((shuffle(X) +transpose(echo((X+transpose(X,7) ) ,4,6) ,7) ) ,-7) +((echo(((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(step((((transpose((X+transpose((X|X) ,7) ) ,4) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,4) ,-7) ,7) ) |transpose(transpose(X,-5) ,4) ) ,12) ,4) ) +transpose((transpose(transpose(transpose(transpose(X,-5) ,-5) ,-7) ,-7) +transpose(step(((X|X) +transpose((X+transpose(X,7) ) ,12) ) ,12) ,12) ) ,7) ) ,12) ) ,12) ) +transpose(((arpeggio(transpose((transpose(transpose((shuffle(shuffle(X) ) +arpeggio((transpose(X,4) +transpose(shuffle(X) ,7) ) ) ) ,-5) ,-5) +transpose(echo(echo(((((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) +transpose((X+transpose(X,12) ) ,12) ) |(echo(X,4,6) +transpose(transpose(X,-5) ,12) ) ) ,4,6) ,4,6) ,7) ) ,-7) ) +transpose(((((X+transpose((((X+X) +transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) |(transpose(X,-7) +arpeggio(X) ) ) +transpose(transpose(transpose(((X|shuffle(X) ) |(arpeggio(step(X,12) ) +(((X+transpose(X,7) ) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,4) ,-5) ,7) ) ,7) ) +transpose((step(transpose((shuffle(shuffle((echo(X,4,6) +transpose((X|X) ,7) ) ) ) +transpose(transpose((X|((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,-7) ,7) ) ,-7) ,12) |shuffle(arpeggio((((step(transpose(transpose(X,-7) ,4) ,12) +step((X|(X+transpose(X,7) ) ) ,12) ) +transpose((transpose(step(X,12) ,4) +arpeggio(X) ) ,-5) ) +transpose(shuffle((X+(X|X) ) ) ,-5) ) ) ) ) ,12) ) ,7) ) random seed used was 1
EXPR = transpose(((transpose(((step(transpose(X,-5) ,12) |arpeggio(((transpose((X|X) ,-5) +transpose((X|X) ,4) ) +transpose(shuffle(step(X,12) ) ,7) ) ) ) +transpose(shuffle((step(shuffle(X) ,12) |(transpose(X,-7) +transpose((X+transpose(X,12) ) ,7) ) ) ) ,12) ) ,-7) |transpose(((transpose((X+transpose(X,12) ) ,-7) |step((echo(X,4,6) |step(X,12) ) ,12) ) |transpose((((((X+X) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,-5) ,12) ) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose(((X+transpose(X,7) ) |(X|(X|(X+transpose(X,12) ) ) ) ) ,7) ) ,4) ) ,-5) ) +transpose(((step(transpose(transpose(transpose(X,4) ,4) ,-5) ,12) +transpose((transpose(transpose(shuffle(X) ,-7) ,-7) +transpose(transpose((X|step(X,12) ) ,4) ,12) ) ,4) ) +transpose(((transpose(transpose(((((transpose(transpose(transpose(X,-5) ,-7) ,4) +transpose(((X|X) +transpose(((X+transpose(X,7) ) +shuffle(X) ) ,12) ) ,4) ) +transpose(((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) |shuffle((X+transpose((X+transpose(X,7) ) ,12) ) ) ) +transpose(echo(transpose(X,4) ,4,6) ,12) ) ,-7) ,-5) +transpose(arpeggio((echo((transpose(X,-5) |transpose((X+transpose(X,7) ) ,-5) ) ,4,6) |transpose(((X+X) +transpose(X,7) ) ,4) ) ) ,4) ) +transpose((step(echo(transpose(X,-7) ,4,6) ,12) |(transpose(shuffle(transpose((step(X,12) +transpose(X,12) ) ,4) ) ,-5) |echo((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +transpose((transpose(X,4) +transpose(X,7) ) ,7) ) +transpose(transpose(((X|X) |(X+X) ) ,4) ,4) ) +transpose(transpose((X+X) ,-5) ,7) ) ,4,6) ) ) ,7) ) ,7) ) ,-7) ) ,-5) random seed used was 0
EXPR = ((((transpose(transpose(transpose(transpose(transpose((X|X) ,4) ,4) ,-5) ,-5) ,-5) +transpose(arpeggio(((transpose(shuffle((transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4) |X) ) ,4) +transpose(echo(arpeggio(transpose(((((X+transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(X,7) ) |transpose(transpose(X,-5) ,4) ) ,-5) ) ,4,6) ,7) ) +transpose(shuffle(transpose((((X+transpose((transpose(X,4) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) |(transpose(X,-5) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ) ,-5) ) ,7) ) ) ,12) ) +transpose(transpose(transpose(transpose(((transpose(arpeggio(transpose(X,4) ) ,4) +((X+transpose(transpose(arpeggio(X) ,-5) ,12) ) +transpose(transpose((X|X) ,-5) ,12) ) ) |transpose(transpose(transpose(X,4) ,-7) ,-5) ) ,4) ,-5) ,-5) ,4) ) +transpose(((((transpose((((transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,-7) +transpose(((step(X,12) +transpose(echo(transpose(X,-7) ,4,6) ,12) ) +transpose(X,12) ) ,4) ) +transpose(((transpose(X,-7) |transpose(X,-5) ) |(X|transpose((X+X) ,-5) ) ) ,7) ) +transpose(step(transpose((X|X) ,-7) ,12) ,7) ) ,-5) +transpose(transpose(arpeggio(transpose(transpose(transpose(X,-7) ,4) ,-5) ) ,-5) ,7) ) +transpose(arpeggio(transpose(step(step(transpose((X+transpose(X,12) ) ,4) ,12) ,12) ,-7) ) ,4) ) +transpose(shuffle((((transpose(transpose(X,-7) ,-7) |echo(shuffle((X+transpose(X,12) ) ) ,4,6) ) |(((arpeggio(X) +transpose(((transpose(X,4) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(step(transpose(X,-5) ,12) ,7) ) ,12) ) +transpose(transpose(transpose(step(X,12) ,4) ,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) ) |transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((shuffle((X|X) ) |transpose((X+transpose(X,12) ) ,-7) ) ,12) ) ,4) ,-5) ) ) ,7) ) +transpose((transpose(transpose((echo(X,4,6) +X) ,-5) ,4) +transpose(((step(transpose((((X+transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) +transpose((X+transpose(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,4) ) +transpose((step(X,12) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,7) ) ,4) ,12) +transpose(echo((transpose(X,-7) +transpose(X,12) ) ,4,6) ,4) ) +transpose(((transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(step((X+transpose(X,7) ) ,12) ,4) ) +transpose(((X+transpose((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose((X|arpeggio(X) ) ,7) ) ,7) ) ,7) ) ,7) ) ,7) ) ,7) ) |step(transpose((arpeggio(transpose((transpose((X|X) ,-7) |arpeggio((X+X) ) ) ,4) ) |arpeggio(transpose(transpose(transpose(echo(X,4,6) ,4) ,-7) ,-5) ) ) ,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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