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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(((shuffle((transpose(((arpeggio(transpose((((X+transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((X+echo(X,4,6) ) ,12) ) ,-5) ) +((((step(X,12) +X) +transpose(((transpose(X,-5) +transpose(arpeggio(X) ,4) ) +transpose((X+X) ,7) ) ,12) ) |(transpose(transpose(X,4) ,-5) +arpeggio(X) ) ) +transpose((step(transpose(step(((X+transpose(X,7) ) +transpose(X,4) ) ,12) ,4) ,12) +transpose((transpose(step(X,12) ,-5) |transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,-5) ) ,7) ) ,7) ) ) +transpose((step((X+X) ,12) +transpose(arpeggio(X) ,-7) ) ,12) ) ,-5) +transpose((transpose(echo(shuffle(transpose(((transpose((shuffle(X) +transpose((X|X) ,12) ) ,-7) +transpose(transpose((transpose(X,4) +transpose((transpose(transpose(X,-5) ,-5) +transpose(transpose((X+X) ,4) ,12) ) ,12) ) ,4) ,4) ) +transpose(echo((step(X,12) |transpose(X,-5) ) ,4,6) ,7) ) ,4) ) ,4,6) ,4) +transpose((transpose(transpose(echo(shuffle(transpose(transpose(X,-7) ,-7) ) ,4,6) ,4) ,-7) |step(shuffle(arpeggio((((((transpose(X,4) +(X+X) ) +(X+transpose(X,12) ) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +X) ) +shuffle((transpose(step(X,12) ,-7) +transpose(echo(X,4,6) ,12) ) ) ) +transpose(((X+transpose((X+transpose(X,7) ) ,4) ) |transpose((echo(X,4,6) +echo(X,4,6) ) ,4) ) ,7) ) ) ) ,12) ) ,12) ) ,7) ) ) |transpose(transpose((((echo(transpose((transpose((X|X) ,-7) +(transpose(transpose((echo(X,4,6) +transpose(X,-5) ) ,-7) ,-7) +transpose(arpeggio((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) ) ,12) ) ) ,-5) ,4,6) +transpose(((echo(transpose(step((((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(X,4) ) +transpose(step((X+X) ,12) ,12) ) ,12) ,4) ,4,6) +transpose(shuffle((transpose(echo(echo((X+transpose(X,7) ) ,4,6) ,4,6) ,-7) +(transpose(transpose(arpeggio(X) ,-5) ,4) +transpose(transpose(arpeggio(((X|(X+transpose(X,7) ) ) +transpose(arpeggio((X|X) ) ,7) ) ) ,-7) ,7) ) ) ) ,4) ) +transpose(((((((shuffle(X) +transpose((shuffle(X) +transpose(transpose(X,4) ,7) ) ,4) ) +transpose((transpose(X,-5) |(X+X) ) ,7) ) +transpose(echo((transpose(X,-7) +transpose(echo((X+X) ,4,6) ,12) ) ,4,6) ,4) ) +transpose(((transpose(transpose((X+transpose(X,12) ) ,4) ,-7) +transpose(((X+transpose(X,12) ) +X) ,4) ) +transpose((arpeggio(shuffle(X) ) +transpose((shuffle(X) +transpose((X|X) ,7) ) ,12) ) ,7) ) ,7) ) +transpose((X|transpose(((X+X) +X) ,4) ) ,12) ) +transpose(transpose(step(step(transpose((X+X) ,-7) ,12) ,12) ,-7) ,12) ) ,7) ) ,12) ) +transpose(((transpose(echo((X+transpose((X+transpose(transpose(X,-7) ,7) ) ,12) ) ,4,6) ,-5) +transpose(transpose((transpose(((transpose(shuffle((X+X) ) ,-7) +transpose((X|X) ,-7) ) |transpose((echo(X,4,6) +(X|X) ) ,4) ) ,-5) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) ) ,-7) ,4) ) +transpose(arpeggio((transpose((X+X) ,-5) |transpose(X,-7) ) ) ,7) ) ,12) ) +transpose((((echo(shuffle(transpose(echo(shuffle((transpose((transpose(X,-5) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,7) ) ,-7) |transpose(transpose(((X+transpose(X,12) ) +(X|X) ) ,4) ,-7) ) ) ,4,6) ,-5) ) ,4,6) +transpose(transpose(transpose((shuffle(((transpose((shuffle(X) |(X|X) ) ,-5) |step((X+X) ,12) ) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) |step(X,12) ) ,-7) ) ) +transpose((((transpose(X,4) |X) +transpose((X+transpose(transpose(X,-7) ,12) ) ,7) ) +shuffle(echo(X,4,6) ) ) ,-5) ) ,-7) ,4) ,4) ) +transpose((transpose((transpose((((transpose((X+transpose(X,7) ) ,4) +transpose(transpose(X,4) ,4) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) +transpose((X+(X+step(X,12) ) ) ,12) ) ,-5) +X) ,-5) |step((transpose(((shuffle(transpose((X+X) ,4) ) +transpose(transpose(transpose((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ,-5) ,4) ) +transpose((((transpose((transpose(X,4) +X) ,-7) +transpose(transpose(X,-7) ,7) ) +(step((shuffle(X) +transpose(X,12) ) ,12) +transpose(((step(transpose(X,-5) ,12) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,7) ) ) +transpose((((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(((X|X) +transpose(transpose(X,-5) ,7) ) ) ,12) ) ,7) ) ,7) ) ,-7) |(((((X+transpose(X,4) ) +transpose(X,7) ) +step(X,12) ) +transpose(transpose(X,4) ,-5) ) +transpose(((echo((transpose(X,-7) +transpose(X,-7) ) ,4,6) +transpose((shuffle(X) +step(X,12) ) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) ) ,12) ) ,7) ) |transpose(transpose(((((((((X|shuffle(X) ) +transpose(echo(X,4,6) ,4) ) +transpose((arpeggio(X) +transpose((X+X) ,12) ) ,7) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,-7) ,4) ) +transpose(((X+(X+transpose(X,12) ) ) +transpose(X,-7) ) ,7) ) |step((((X|X) +(X+X) ) |step(echo(X,4,6) ,12) ) ,12) ) +transpose((echo(transpose(X,-5) ,4,6) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,12) ) ,-5) ) +(step(shuffle(transpose(echo(X,4,6) ,4) ) ,12) +transpose(((transpose((X+X) ,-5) +X) +transpose(arpeggio((transpose((X+transpose(X,7) ) ,-7) +(X+X) ) ) ,7) ) ,-5) ) ) ,4) ,4) ) ,12) ) ,-5) ,-7) ) +transpose(transpose(transpose(transpose(transpose((echo((((((X+transpose((transpose(X,4) +transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) |transpose(X,-5) ) |transpose(transpose(transpose((X|X) ,4) ,4) ,-5) ) |(transpose(((X|X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) |(((X|X) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ) +(((X+transpose(X,4) ) +transpose((X+X) ,7) ) +shuffle((X+X) ) ) ) ) ) ,4,6) |transpose((transpose(((echo(X,4,6) +transpose((X+X) ,7) ) |(transpose(X,4) +transpose(transpose((X+transpose(X,7) ) ,4) ,12) ) ) ,-5) +echo(X,4,6) ) ,-5) ) ,4) ,4) ,-7) ,4) ,4) ) ,4) random seed used was 201800707
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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