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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 16 generations the expression "X" became this: | (((transpose(transpose(transpose(transpose(shuffle(transpose(transpose(X,4) ,-7) ) ,-7) ,-7) ,-5) ,-5) |transpose(transpose(transpose(step((transpose(((shuffle((X+transpose(X,12) ) ) +transpose(arpeggio((X|X) ) ,7) ) |arpeggio(X) ) ,4) +transpose(transpose((X+transpose(((X+X) +(X+transpose(X,7) ) ) ,7) ) ,-7) ,12) ) ,12) ,-5) ,4) ,-5) ) +transpose(echo((transpose(((((((X|step(X,12) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) |transpose((transpose(X,-5) +transpose((X+X) ,7) ) ,-5) ) +transpose(transpose(transpose(arpeggio((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,-7) ,4) ,7) ) +transpose(transpose((((((transpose(X,-5) |X) |transpose(echo(X,4,6) ,-5) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,12) ) +transpose((X+(X+X) ) ,4) ) +transpose(((((X|X) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) +transpose(arpeggio(((X+transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,7) ) ,7) ) ,4) ,-7) ) +transpose(transpose((step((transpose(transpose(X,4) ,4) |X) ,12) |(X+transpose((X|X) ,-7) ) ) ,-5) ,7) ) ,4) +transpose((transpose((step((transpose(transpose(X,4) ,-7) +transpose(transpose(echo(transpose(transpose(X,-5) ,-5) ,4,6) ,-7) ,12) ) ,12) +(((echo((transpose((transpose(transpose(X,-5) ,4) +(X|X) ) ,-7) +step(transpose(X,4) ,12) ) ,4,6) +transpose((transpose(X,4) +transpose(transpose(transpose((X+transpose((X+X) ,7) ) ,-7) ,-5) ,12) ) ,4) ) +transpose((((arpeggio(echo(step(X,12) ,4,6) ) +transpose(X,4) ) +transpose(((arpeggio(transpose(X,-7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,4) ,7) ) ,7) ) +(((echo(X,4,6) +transpose(transpose(((X+X) +X) ,4) ,4) ) +transpose((arpeggio(X) +X) ,7) ) +(transpose((transpose(X,-5) |echo(X,4,6) ) ,-5) +transpose(transpose(X,4) ,12) ) ) ) ,7) ) +transpose(((echo((X|X) ,4,6) +transpose(arpeggio(echo((X+arpeggio(X) ) ,4,6) ) ,4) ) +transpose(transpose(transpose(transpose(X,-5) ,4) ,-5) ,7) ) ,-7) ) ) ,-5) |transpose(transpose(shuffle((step(transpose(X,-5) ,12) +(((X|echo(X,4,6) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) ) ) ,4) ,4) ) ,7) ) ,4,6) ,4) ) +transpose((((((((((((transpose(X,4) +X) +transpose(X,4) ) +transpose(X,7) ) +((transpose(arpeggio(X) ,4) +transpose((X+X) ,7) ) +transpose(transpose(((X+transpose(X,7) ) +transpose(shuffle(X) ,12) ) ,-7) ,12) ) ) +transpose(((arpeggio((step(arpeggio(X) ,12) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ) +transpose((X|(X+transpose(X,12) ) ) ,7) ) +transpose(((transpose(echo(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4,6) ,4) +transpose((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) ,4) ) +transpose((transpose(transpose(X,-7) ,4) |(X+transpose(X,12) ) ) ,7) ) ,7) ) ,4) ) +transpose((transpose((arpeggio(transpose(X,4) ) +((X|((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(echo(X,4,6) ,7) ) ) ,4) +transpose(((arpeggio((transpose(X,-5) |(arpeggio(X) +transpose(transpose(X,4) ,7) ) ) ) +transpose(shuffle((X|X) ) ,4) ) +transpose((arpeggio(transpose(X,-5) ) +shuffle((X|X) ) ) ,7) ) ,12) ) ,7) ) +transpose(step(transpose(echo(transpose(X,4) ,4,6) ,-7) ,12) ,4) ) +shuffle(transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) +transpose(shuffle((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +echo((X|X) ,4,6) ) ) ,7) ) +(transpose(arpeggio(shuffle(transpose(transpose(transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +((X|X) +X) ) ,-7) ,4) ,-7) ,-5) ) ) ,-5) |step(echo((echo((arpeggio((X+transpose(X,-5) ) ) |transpose(transpose(X,4) ,-7) ) ,4,6) +transpose(transpose(transpose(((arpeggio(X) +transpose((X+transpose(transpose(X,4) ,12) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,-5) ,-7) ) ,4,6) ,12) ) ) +transpose(((((((((transpose(X,-5) +echo((X+X) ,4,6) ) +echo(transpose(arpeggio(X) ,-5) ,4,6) ) +transpose(((transpose((transpose(echo(X,4,6) ,-7) |(X+transpose(X,12) ) ) ,-5) +transpose(((X|(X+transpose(X,7) ) ) +transpose(shuffle((X+X) ) ,12) ) ,4) ) +transpose(transpose(transpose(transpose((X|X) ,-5) ,-5) ,-7) ,7) ) ,12) ) |(echo(transpose(transpose(X,-7) ,-5) ,4,6) |arpeggio(transpose((arpeggio((X+X) ) |arpeggio(X) ) ,4) ) ) ) +transpose(transpose((transpose(echo(X,4,6) ,-5) +shuffle((((X+transpose((X+transpose(X,12) ) ,7) ) +transpose((X|(X+X) ) ,4) ) +transpose((X+X) ,7) ) ) ) ,4) ,7) ) +arpeggio(((transpose(arpeggio(X) ,4) |transpose(transpose(X,-5) ,-5) ) +(transpose(transpose(X,-7) ,-7) +(echo(X,4,6) |transpose(X,-7) ) ) ) ) ) +((((transpose(transpose(transpose(shuffle(X) ,4) ,-7) ,-7) +transpose(echo(shuffle(X) ,4,6) ,12) ) +transpose((shuffle(transpose(transpose(X,4) ,-5) ) +transpose((step((((X+transpose(X,4) ) +transpose(X,7) ) |(X|X) ) ,12) +transpose((arpeggio(X) |transpose((X|X) ,-5) ) ,7) ) ,7) ) ,4) ) +transpose(transpose(transpose(shuffle(transpose(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,-5) ) ,-5) ,-5) ,7) ) +transpose(echo(transpose((((transpose((X+transpose(shuffle(arpeggio(X) ) ,7) ) ,4) |(X|transpose(transpose(X,-5) ,4) ) ) +transpose(((X|X) +arpeggio((X+transpose(X,7) ) ) ) ,4) ) +transpose(transpose(((shuffle(((transpose(X,-5) +transpose((X+X) ,12) ) +step(X,12) ) ) +transpose(transpose((X+X) ,-7) ,4) ) +transpose(X,7) ) ,-5) ,7) ) ,-5) ,4,6) ,7) ) ) +transpose(((shuffle(transpose(transpose(transpose((((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,4) ) +transpose((arpeggio(X) +(X+X) ) ,7) ) ,-5) ,4) ,-7) ) +transpose(transpose(transpose(transpose(transpose(X,-7) ,-7) ,4) ,4) ,7) ) |transpose(arpeggio(((transpose(arpeggio(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ) ,-7) +transpose(((transpose(((X+X) |transpose(X,-7) ) ,-5) +transpose((((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) |((X+X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) +transpose(X,-7) ) ,7) ) |((((X|transpose(X,-5) ) +transpose(transpose((transpose(X,-7) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,4) ) +transpose((((echo(X,4,6) |echo(X,4,6) ) +transpose((((X+transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) +transpose(shuffle(((X+transpose(X,12) ) +(X+transpose(X,7) ) ) ) ,12) ) ) ) ,-5) ) ,7) ) ,7) ) ,7) ) random seed used was 11252492
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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