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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 19 generations the expression "X" became this: | transpose(((arpeggio(arpeggio(transpose((transpose((step((step(arpeggio(step(X,12) ) ,12) +transpose(transpose(shuffle(X) ,4) ,4) ) ,12) +transpose(echo(((((X|X) +(X+X) ) |echo(transpose(X,4) ,4,6) ) +transpose((((X+transpose(X,7) ) |transpose(X,-5) ) |X) ,12) ) ,4,6) ,7) ) ,-5) +transpose(echo((transpose((X|X) ,-7) |echo(step(X,12) ,4,6) ) ,4,6) ,-5) ) ,-7) ) ) +transpose(transpose(echo(transpose(arpeggio(((transpose(X,-5) +transpose(transpose(step((X+transpose(X,12) ) ,12) ,-7) ,12) ) |transpose(shuffle(arpeggio(X) ) ,-5) ) ) ,-7) ,4,6) ,-7) ,7) ) +transpose((transpose(transpose((arpeggio(transpose(((arpeggio((step(transpose(X,-7) ,12) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ) +transpose(((((echo(X,4,6) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,-7) ) +shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,7) ) +transpose(transpose(transpose(transpose(transpose(X,-5) ,4) ,4) ,-7) ,12) ) ,-7) ) +transpose(transpose(((shuffle((((transpose(X,-7) |shuffle(X) ) +transpose(transpose(shuffle(transpose(X,4) ) ,4) ,12) ) +transpose((transpose(X,-7) |((X+transpose(X,7) ) +(arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,12) ) ) +transpose(transpose((arpeggio(transpose(step(X,12) ,-5) ) |(((transpose(X,-5) |step(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,4) ,4) ) +transpose(transpose(transpose((X|echo(echo(X,4,6) ,4,6) ) ,4) ,-5) ,7) ) ,-5) ,7) ) ,4) ,-5) +transpose(((transpose((((((echo((transpose(step(X,12) ,-7) +transpose(arpeggio(shuffle(transpose(X,-5) ) ) ,7) ) ,4,6) |((((shuffle(transpose(((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ,-5) ) +transpose((transpose(transpose(X,-5) ,4) +transpose(shuffle(step(X,12) ) ,12) ) ,7) ) |(transpose(echo(echo(X,4,6) ,4,6) ,-5) +transpose((X+transpose(transpose(echo(X,4,6) ,4) ,7) ) ,7) ) ) +transpose(transpose(echo(((transpose(step(X,12) ,-7) +transpose((X+transpose((X+X) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ,4) ,4) ) +transpose(echo(transpose(arpeggio(transpose((X|X) ,-5) ) ,4) ,4,6) ,7) ) ) +transpose((transpose(shuffle(transpose((arpeggio(echo(X,4,6) ) |(step(X,12) |X) ) ,-5) ) ,4) +transpose((shuffle((((X|X) +transpose(transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,4) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ) |transpose(((step(X,12) +arpeggio(transpose(X,4) ) ) +transpose(transpose(step(step((X+X) ,12) ,12) ,4) ,7) ) ,-5) ) ,7) ) ,12) ) +transpose(transpose((((transpose(echo(echo((X|X) ,4,6) ,4,6) ,-7) +transpose(((X+transpose(((shuffle((shuffle(X) +transpose(X,7) ) ) +transpose(transpose(X,-5) ,4) ) +transpose(((arpeggio(X) +transpose((X|X) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,4) ) +transpose(((transpose(X,4) +((X+transpose(X,7) ) +(X+X) ) ) +((X|X) +shuffle((X+X) ) ) ) ,7) ) ,7) ) +(arpeggio((transpose(X,-7) +transpose(X,4) ) ) |transpose((arpeggio(X) +transpose(transpose(X,-5) ,7) ) ,-5) ) ) |(shuffle(step(X,12) ) |transpose(arpeggio(X) ,-7) ) ) ,-7) ,4) ) +transpose((transpose(arpeggio(((X+X) +(X+transpose(transpose(X,4) ,12) ) ) ) ,4) +echo(transpose(transpose(arpeggio(X) ,-5) ,-7) ,4,6) ) ,7) ) |(shuffle((transpose(transpose(shuffle(((echo(X,4,6) +shuffle(transpose(X,-7) ) ) +transpose(shuffle(X) ,-7) ) ) ,4) ,-5) +transpose(((transpose(step(X,12) ,4) +transpose(transpose(transpose(X,4) ,-7) ,7) ) +(arpeggio(((X+transpose(X,7) ) +transpose((((X+X) +transpose((X+X) ,12) ) +transpose((X+transpose((X|X) ,7) ) ,12) ) ,12) ) ) |((X+shuffle(X) ) |((((transpose(X,4) +transpose(step(X,12) ,4) ) +transpose(X,7) ) +transpose(step(transpose(X,4) ,12) ,7) ) |(transpose(X,-5) +transpose((X+transpose(X,7) ) ,12) ) ) ) ) ) ,7) ) ) +transpose(transpose(transpose(echo(transpose(((X|X) +transpose((X+X) ,12) ) ,4) ,4,6) ,-7) ,4) ,12) ) ) ,-7) +echo(((((step((((X+transpose((shuffle(X) +transpose(X,4) ) ,12) ) +transpose(echo(arpeggio(X) ,4,6) ,12) ) |(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,12) ) +transpose(X,-7) ) ) ,12) |transpose(transpose(((((X+transpose(X,4) ) +transpose(transpose((X+X) ,-7) ,7) ) +transpose((X|X) ,-7) ) |transpose((transpose((X|X) ,-5) |transpose(X,-5) ) ,-7) ) ,4) ,4) ) +(transpose((echo(arpeggio(transpose(X,-5) ) ,4,6) |((X|X) +arpeggio((((X+transpose(X,12) ) +transpose((X+X) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ) ) ,4) +transpose(transpose(shuffle((shuffle(((X|X) +transpose(shuffle(X) ,7) ) ) |transpose(shuffle(X) ,4) ) ) ,-7) ,12) ) ) +transpose((arpeggio((transpose(transpose((transpose(((X|transpose(X,-5) ) |X) ,-5) +transpose((transpose((step(X,12) +transpose(X,12) ) ,4) +((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,12) ) ) ,7) ) ,-5) ,-5) +transpose(transpose(transpose((transpose(transpose(transpose(X,-7) ,4) ,-5) +((X|transpose(X,-7) ) +transpose(arpeggio(X) ,4) ) ) ,-5) ,-5) ,12) ) ) +transpose(((((step(transpose(X,-5) ,12) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) +(X+X) ) +(transpose(echo(X,4,6) ,-7) |transpose((transpose(X,4) +transpose(transpose(X,-7) ,7) ) ,-5) ) ) +transpose(((arpeggio(transpose(transpose((X|X) ,-5) ,-5) ) +(arpeggio(X) |transpose((X|X) ,4) ) ) +transpose((((X|X) +transpose(shuffle(transpose((X+X) ,4) ) ,7) ) |((((X|X) +transpose(step(X,12) ,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) ) ,12) ) ,12) ) ,7) ) ,7) ) |arpeggio((((transpose(transpose(X,-7) ,-7) |(transpose(X,-7) +transpose(transpose(transpose((X|X) ,-7) ,-7) ,7) ) ) +transpose((((shuffle(X) |X) +transpose(echo(X,4,6) ,4) ) +transpose(((step(((step(X,12) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,12) +transpose((arpeggio(shuffle(X) ) +transpose(arpeggio((X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,7) ) +(((transpose(transpose(X,4) ,4) |(shuffle(X) +transpose((transpose(X,-5) |step((X+transpose(X,12) ) ,12) ) ,12) ) ) +transpose(arpeggio(transpose(echo((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,4) ) ,7) ) +transpose(((transpose(X,-5) +transpose((X|(X|X) ) ,7) ) |transpose(((X+transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,-5) ) ,12) ) ) ) ) ,4,6) ) |step(echo(transpose(transpose((((transpose(((X+(X+transpose(X,7) ) ) |(transpose(X,-5) +transpose((X+X) ,7) ) ) ,4) |transpose((transpose(transpose(X,-7) ,-5) +step(X,12) ) ,4) ) +echo((transpose(X,-7) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ) |(echo((shuffle(arpeggio(transpose((X+transpose(X,7) ) ,-7) ) ) |arpeggio(X) ) ,4,6) +transpose(step(echo(X,4,6) ,12) ,-7) ) ) ,-5) ,4) ,4,6) ,12) ) ,12) ) ,7) ) ,-7) random seed used was 65007987
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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