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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: | echo((((((echo(transpose((X+X) ,4) ,4,6) +transpose(arpeggio((X|transpose(X,-7) ) ) ,4) ) +transpose(transpose(((step(arpeggio(transpose((X+X) ,4) ) ,12) +transpose((((((X+X) +transpose(step(X,12) ,7) ) +transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) |((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) |(echo(X,4,6) |transpose(X,-5) ) ) ) ,4) ) +transpose(step(((X|transpose(X,4) ) +X) ,12) ,7) ) ,-7) ,7) ) +(transpose(transpose(transpose((transpose(((X+(X+transpose(X,7) ) ) |(X+transpose(transpose(X,4) ,12) ) ) ,-7) |shuffle(transpose(X,4) ) ) ,-7) ,4) ,-5) +transpose(((transpose(transpose(transpose(((transpose((X+X) ,-5) |transpose((X+transpose(X,12) ) ,4) ) +transpose(arpeggio(X) ,12) ) ,-7) ,-7) ,4) +transpose(shuffle(echo(X,4,6) ) ,4) ) +transpose(transpose(transpose(shuffle(X) ,-5) ,-7) ,7) ) ,12) ) ) |transpose(transpose(step(transpose((transpose((echo(X,4,6) +transpose((X+X) ,12) ) ,-7) +transpose(step(transpose((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(X,-7) ,7) ) ,4) ,12) ,12) ) ,-5) ,12) ,4) ,-5) ) +transpose(((((arpeggio((echo((((((transpose(X,-7) +X) +transpose(transpose(transpose((X|X) ,4) ,4) ,4) ) +transpose(arpeggio(((((X|X) +transpose(step(X,12) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(X,12) ) ) ,7) ) |step(echo(transpose(X,-7) ,4,6) ,12) ) |transpose(step((transpose(transpose((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) ,4) ,-5) +transpose(transpose(transpose(X,4) ,-7) ,-5) ) ,12) ,-5) ) ,4,6) +transpose(transpose(((((transpose(transpose(transpose(X,4) ,4) ,-7) +transpose((arpeggio(transpose(X,-5) ) |(X+transpose(X,4) ) ) ,4) ) +transpose(((transpose((X|X) ,-5) +transpose(transpose(X,-7) ,4) ) +transpose((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose((transpose(step(echo(X,4,6) ,12) ,-5) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) +transpose(transpose(X,-7) ,-7) ) ) ,7) ) ,-5) ,7) ) ) |step((((transpose((shuffle(((X+X) +transpose(transpose(X,-7) ,7) ) ) +transpose((X|X) ,7) ) ,-7) +transpose(((transpose(((X+transpose((X+X) ,7) ) +transpose(X,-7) ) ,-7) |transpose(transpose(X,4) ,4) ) +transpose((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) ,-7) +(((X|X) |step(X,12) ) |transpose(transpose(X,4) ,-7) ) ) ,7) ) ,4) ) +transpose(step(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,12) ) ,-5) ,12) ,7) ) +echo(((step(((X+transpose(X,12) ) +echo(X,4,6) ) ,12) +(transpose((step(X,12) +(X|X) ) ,4) |arpeggio(X) ) ) +transpose(step(transpose(shuffle((transpose(X,-7) +transpose(((X+X) |step(X,12) ) ,7) ) ) ,-5) ,12) ,7) ) ,4,6) ) ,12) ) +transpose((transpose((((transpose(((arpeggio(transpose(X,-7) ) +transpose((transpose(X,4) |(X|X) ) ,4) ) +transpose(echo((X|X) ,4,6) ,7) ) ,4) +transpose((transpose((arpeggio(step(arpeggio(X) ,12) ) +transpose(shuffle(X) ,7) ) ,-5) +(((transpose((X|X) ,-7) +transpose((transpose((X+transpose(X,7) ) ,-5) |(X|X) ) ,7) ) |(transpose((X+X) ,4) +transpose((transpose(echo(X,4,6) ,4) +((X+transpose(X,4) ) +transpose((X|X) ,7) ) ) ,7) ) ) +(((step(X,12) |X) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ) ) ,4) ) +transpose(transpose(((transpose(arpeggio(X) ,4) +echo(((shuffle(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) ) +transpose(echo(shuffle(((X|X) |X) ) ,4,6) ,12) ) ,4) ,7) ) +(transpose(echo(((transpose((X|X) ,4) +echo(X,4,6) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) ,4,6) ,4) |transpose((((echo((X+X) ,4,6) +transpose(step(X,12) ,12) ) +(X+transpose(X,-5) ) ) +transpose(shuffle(((step(X,12) |((X+X) +X) ) |X) ) ,12) ) ,-5) ) ) ,-7) +transpose(shuffle((((step(X,12) |(X|X) ) |arpeggio(((((X|transpose(X,4) ) +(X+transpose(X,12) ) ) +transpose(transpose(transpose(shuffle(transpose(X,-7) ) ,4) ,-7) ,4) ) +transpose(transpose(step(X,12) ,-5) ,7) ) ) ) +transpose((transpose((arpeggio(X) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,-5) +(echo((X|transpose((X+X) ,4) ) ,4,6) |transpose(step(X,12) ,-5) ) ) ,12) ) ) ,12) ) ,4) ) +transpose(echo((((transpose(transpose((shuffle((transpose(X,-7) +transpose(X,7) ) ) +(X+transpose(X,7) ) ) ,-7) ,4) |transpose(transpose(transpose((shuffle(transpose(X,-7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,4) ,-5) ) +transpose(((transpose(transpose((X+transpose(X,12) ) ,-7) ,4) +transpose((((echo(transpose(X,-7) ,4,6) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) ,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) ,12) ) +transpose((transpose(echo((X+arpeggio(X) ) ,4,6) ,4) |shuffle(shuffle((transpose(X,-7) |(X|X) ) ) ) ) ,12) ) ,-7) ) |transpose(transpose((transpose(((echo((X|X) ,4,6) +transpose(echo(transpose(arpeggio(X) ,-5) ,4,6) ,4) ) +transpose(((X|X) |transpose(arpeggio(X) ,-7) ) ,7) ) ,4) |((X+X) +transpose((X+(X+X) ) ,4) ) ) ,-7) ,-7) ) ,4,6) ,7) ) +transpose((arpeggio((shuffle((transpose(transpose(transpose(transpose(shuffle(X) ,-7) ,-5) ,4) ,4) +(transpose(X,-5) +transpose(((step(transpose((X|X) ,4) ,12) +transpose((((transpose(X,-7) +transpose(step(transpose(X,4) ,12) ,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(((X+X) +transpose(X,4) ) ,7) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,12) ) ) ) +transpose(transpose((X+transpose(arpeggio(X) ,-5) ) ,4) ,4) ) ) +transpose(echo((step((((transpose(X,-5) +transpose(transpose((X|X) ,4) ,4) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) +(echo(X,4,6) +transpose(transpose(X,4) ,12) ) ) ,12) +transpose((((transpose(X,-7) +transpose(X,7) ) +transpose(((echo((X+transpose(X,12) ) ,4,6) +transpose(X,-5) ) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) ,4) ) +transpose(transpose(transpose(shuffle(X) ,4) ,4) ,7) ) ,4) ) ,4,6) ,-7) ) ,12) ) ,7) ) ,4,6) random seed used was 149680880
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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