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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 20 generations the expression "X" became this: | transpose((arpeggio(arpeggio(transpose(((transpose(transpose((((X|X) +transpose((transpose((X|X) ,4) +transpose(arpeggio(transpose(X,4) ) ,12) ) ,4) ) +transpose(transpose(transpose(transpose((X|X) ,4) ,4) ,-5) ,7) ) ,4) ,4) +transpose(step((((arpeggio(shuffle(X) ) +shuffle((X+(shuffle(shuffle((X+transpose(X,7) ) ) ) |(((transpose(X,4) +transpose(transpose(X,4) ,12) ) +transpose(transpose(echo(echo(X,4,6) ,4,6) ,-5) ,7) ) +transpose(((((X+transpose(X,12) ) |(X+transpose(X,12) ) ) +transpose(step((X+transpose(X,12) ) ,12) ,4) ) +transpose((X|X) ,7) ) ,-5) ) ) ) ) ) +transpose((((((shuffle(X) +transpose(X,7) ) +shuffle(X) ) |transpose(arpeggio(shuffle(echo(X,4,6) ) ) ,4) ) +transpose((X+transpose(((((transpose((X+X) ,-5) +transpose(echo(X,4,6) ,12) ) +transpose(transpose(transpose(X,4) ,-7) ,12) ) +transpose((transpose(((X|(X+shuffle(X) ) ) +transpose(X,4) ) ,-7) |shuffle(((transpose(X,-7) +transpose(shuffle(transpose(X,-7) ) ,4) ) +transpose(((X|X) |X) ,7) ) ) ) ,4) ) +transpose(echo((((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(X,7) ) +transpose((((X|X) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,12) ) ,4,6) ,7) ) ,7) ) ,4) ) +transpose((shuffle((((X+transpose(X,7) ) +transpose(X,12) ) +transpose((echo(shuffle(X) ,4,6) |echo((X+X) ,4,6) ) ,7) ) ) |transpose(echo((X+X) ,4,6) ,4) ) ,7) ) ,4) ) +transpose(transpose(echo(transpose(shuffle(shuffle(transpose(X,-5) ) ) ,4) ,4,6) ,-5) ,7) ) ,12) ,4) ) +transpose(step(((transpose(X,-7) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) +transpose((arpeggio(echo(transpose(transpose(X,-5) ,4) ,4,6) ) |(step(arpeggio(transpose(X,-7) ) ,12) +transpose(transpose(((transpose(X,4) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(X) ,7) ) ,-5) ,7) ) ) ,12) ) ,12) ,7) ) ,-5) ) ) +arpeggio((((echo(((((((arpeggio(X) |(transpose((X+transpose(X,12) ) ,-5) +transpose(echo(X,4,6) ,12) ) ) +transpose((((transpose(transpose(X,-5) ,-7) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((X+transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose((transpose((X+transpose(X,7) ) ,-7) +transpose(transpose((transpose(X,-5) |(X|X) ) ,4) ,12) ) ,12) ) ,12) ) +transpose(((((echo(X,4,6) +transpose((transpose(X,-7) +arpeggio(X) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,7) ) +transpose((X|transpose(X,4) ) ,7) ) +transpose(step((transpose(X,-5) +transpose(transpose(X,4) ,7) ) ,12) ,7) ) ,4) ) +transpose(step(echo(((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) ,12) ,7) ) +transpose(transpose((((arpeggio(X) +transpose((echo(X,4,6) +transpose(X,12) ) ,12) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose(X,7) ) ,4) ,7) ) +transpose(((arpeggio(arpeggio(transpose(X,4) ) ) |transpose(((transpose(X,-7) +transpose(X,7) ) +transpose(arpeggio((transpose(X,4) +transpose(transpose(X,4) ,12) ) ) ,12) ) ,4) ) +transpose(echo(transpose(transpose(transpose((step(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ,12) +transpose(transpose(X,-5) ,7) ) ,4) ,4) ,-5) ,4,6) ,7) ) ,7) ) ,4,6) +transpose(((((transpose((transpose(transpose(transpose((X+X) ,-5) ,4) ,4) |(step(X,12) +(transpose(transpose(X,-5) ,4) +transpose((transpose(X,4) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) ) ,-5) +transpose(transpose((shuffle(shuffle((X+transpose(step(X,12) ,12) ) ) ) |arpeggio(X) ) ,-7) ,7) ) +transpose(transpose(transpose(((transpose(transpose(echo(X,4,6) ,-5) ,-5) +transpose(step(arpeggio(transpose(X,4) ) ,12) ,12) ) +transpose((transpose(transpose(shuffle(shuffle(X) ) ,-7) ,-7) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) |((transpose(X,-5) +transpose(((transpose(X,4) +transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) ,12) ) +transpose(transpose(transpose(X,-5) ,4) ,12) ) ) ) ,12) ) ,-5) ,4) ,4) ) +transpose(((transpose(((transpose((transpose(X,-7) +transpose(X,7) ) ,-5) +transpose(((((X+X) +transpose(X,12) ) +(X+(X+transpose(X,7) ) ) ) |X) ,7) ) +transpose(echo(transpose((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-5) ,4,6) ,12) ) ,-5) |(arpeggio(shuffle(arpeggio((X+transpose(X,7) ) ) ) ) +transpose(((transpose(echo(arpeggio(X) ,4,6) ,-5) +transpose((((transpose(X,-7) |arpeggio(X) ) +(step(X,12) +transpose(X,-5) ) ) +transpose(echo(((transpose(X,4) +transpose((X+X) ,4) ) +transpose(X,7) ) ,4,6) ,12) ) ,7) ) +transpose((X+transpose((transpose(X,-5) +(X+transpose(X,7) ) ) ,12) ) ,12) ) ,12) ) ) |(shuffle(((transpose(transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,4) ,-7) +transpose(transpose(((X+transpose(echo(X,4,6) ,7) ) |transpose(transpose(X,4) ,-5) ) ,4) ,4) ) +transpose(echo(transpose(transpose(((X|X) +transpose(X,12) ) ,-7) ,-5) ,4,6) ,7) ) ) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose(X,4) ) ) ) ,7) ) |transpose((transpose((shuffle(X) +transpose((arpeggio(X) |(transpose(X,4) |(X|X) ) ) ,12) ) ,4) |(transpose(echo(shuffle(X) ,4,6) ,4) +transpose(transpose((X|X) ,4) ,12) ) ) ,4) ) ,12) ) +transpose(step(arpeggio(transpose(transpose(shuffle(echo(X,4,6) ) ,-5) ,-7) ) ,12) ,4) ) +transpose(transpose((arpeggio(arpeggio(((transpose(transpose(X,4) ,-5) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(transpose((X|X) ,-5) ,4) ) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) ,7) ) |(X|transpose(X,-7) ) ) ) ) +transpose((transpose(arpeggio(transpose(transpose(X,-7) ,-7) ) ,-7) |(transpose(transpose((transpose(transpose(X,4) ,-5) +transpose((transpose((X+transpose(echo(X,4,6) ,7) ) ,4) +transpose(echo(X,4,6) ,12) ) ,12) ) ,-7) ,-7) +transpose(((((transpose(((transpose((X+transpose(X,12) ) ,-7) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,4) ) +transpose(X,7) ) ,4) |arpeggio(X) ) +transpose(transpose((transpose(transpose(X,-5) ,-5) +transpose((transpose(X,4) +transpose(transpose(X,4) ,7) ) ,12) ) ,-5) ,4) ) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,7) ) +transpose(((((((X+transpose(X,12) ) +transpose((step(X,12) |X) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) +transpose((X+transpose(X,12) ) ,7) ) |shuffle(X) ) +transpose((transpose(X,4) +transpose(((X|X) +transpose((X|X) ,12) ) ,12) ) ,12) ) ,12) ) ,7) ) ) ,12) ) ,-5) ,7) ) ) ) ,-5) random seed used was 178391300
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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