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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 13 generations the expression "X" became this: | (transpose((echo((transpose(transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,-7) ,4) |shuffle(transpose(step(X,12) ,4) ) ) ,4,6) +transpose(((((transpose(echo(X,4,6) ,4) +((X+X) +transpose(shuffle((X|X) ) ,12) ) ) +transpose((((X+X) +transpose(echo(X,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(transpose(transpose((X+X) ,4) ,4) ,7) ) +transpose((shuffle(transpose(X,4) ) +transpose((transpose(X,4) |step(echo(X,4,6) ,12) ) ,7) ) ,12) ) ,7) ) ,4) +transpose((((((((transpose(((transpose(X,4) +transpose(shuffle(X) ,12) ) +(transpose(step(X,12) ,-5) |(((transpose(X,-5) +X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) ) ) ,-7) |arpeggio(X) ) +transpose(echo(((((X+X) |transpose(X,4) ) +transpose((arpeggio((X+transpose(X,12) ) ) +arpeggio(X) ) ,12) ) +transpose(step(((shuffle(X) |X) |(((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |(X|X) ) ) ,12) ,12) ) ,4,6) ,4) ) +transpose(shuffle((transpose(transpose(X,4) ,-7) +transpose(transpose((((X+(transpose(X,-7) |(X|X) ) ) +transpose(step((shuffle(X) +transpose(transpose(X,-5) ,7) ) ,12) ,12) ) |arpeggio(transpose(step(X,12) ,4) ) ) ,-5) ,7) ) ) ,7) ) +transpose(((transpose(transpose(((transpose(X,4) +transpose(transpose(transpose((transpose(X,4) |X) ,-7) ,-5) ,4) ) +transpose((((X+X) |transpose(X,-5) ) +transpose(X,12) ) ,7) ) ,4) ,-7) +shuffle((transpose(((X|transpose(X,-5) ) +transpose(X,4) ) ,-5) |((X+transpose(X,12) ) +transpose(((arpeggio(X) +transpose(shuffle(X) ,4) ) +transpose((X|X) ,7) ) ,-5) ) ) ) ) +transpose(((transpose((transpose(X,4) |X) ,4) +transpose(echo((X+transpose(X,12) ) ,4,6) ,12) ) +((transpose(transpose(((X|X) +transpose(X,7) ) ,-5) ,4) +transpose(transpose((transpose(shuffle(transpose(X,-7) ) ,4) |shuffle(echo(X,4,6) ) ) ,-7) ,12) ) |(step((X|X) ,12) +transpose(shuffle((((arpeggio(X) +transpose((X|transpose(X,-5) ) ,4) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose((X+X) ,7) ) ) ,7) ) ) ) ,12) ) ,4) ) +transpose(((arpeggio(transpose(transpose(X,-7) ,4) ) +(transpose(transpose((X|step(X,12) ) ,-5) ,4) +echo((X+transpose(X,7) ) ,4,6) ) ) +((transpose((transpose(echo(step(X,12) ,4,6) ,4) |echo(((X|X) +arpeggio(X) ) ,4,6) ) ,-5) +transpose((transpose(transpose(transpose(step(X,12) ,4) ,-7) ,-5) |((transpose(shuffle(X) ,-5) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(arpeggio(((X+X) +arpeggio(X) ) ) ,4) ,7) ) ) ,12) ) |(transpose(((transpose(X,-7) +transpose(transpose((X+transpose(transpose(X,4) ,7) ) ,4) ,7) ) +transpose(step(((transpose(X,4) +transpose(X,7) ) |(transpose(X,-5) +transpose(X,7) ) ) ,12) ,7) ) ,-5) +transpose(arpeggio((transpose(arpeggio(transpose(transpose(X,4) ,-7) ) ,4) +transpose((transpose(X,4) +transpose((shuffle(X) +X) ,12) ) ,12) ) ) ,12) ) ) ) ,7) ) +transpose(arpeggio(((transpose(echo(transpose(transpose(((X+X) |(((X+transpose(X,4) ) +transpose(X,7) ) +X) ) ,-5) ,4) ,4,6) ,-5) +transpose(shuffle((transpose(transpose(((echo(step(X,12) ,4,6) |shuffle(X) ) +transpose(transpose(X,4) ,12) ) ,4) ,-7) +transpose((transpose((((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose((X+X) ,7) ) ,4) +transpose((arpeggio((shuffle(X) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ) +(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,12) +transpose(shuffle((X+transpose(X,12) ) ) ,-7) ) ) ,12) ) ,12) ) ) ,4) ) +transpose((arpeggio((((transpose(shuffle(X) ,-7) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +X) +transpose(arpeggio(X) ,4) ) ) +((shuffle(transpose(X,4) ) +transpose(transpose((shuffle(arpeggio(X) ) +transpose(transpose(X,-7) ,7) ) ,-5) ,7) ) |shuffle(transpose((step(X,12) |arpeggio(X) ) ,-7) ) ) ) ,7) ) ) ,4) ) +transpose(transpose(arpeggio((transpose(X,4) |transpose(X,-7) ) ) ,4) ,7) ) ,12) ) random seed used was 141818397
EXPR = (((step(((((arpeggio(X) +arpeggio(shuffle(X) ) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,4) ) +transpose(step((step(X,12) +transpose(X,7) ) ,12) ,7) ) +(transpose(step((echo(X,4,6) |X) ,12) ,4) +echo((X+(X|X) ) ,4,6) ) ) ,12) +(((transpose(X,-7) |((X+transpose(X,4) ) +transpose(X,7) ) ) |transpose(((transpose((X|X) ,4) +transpose((transpose(X,-7) |(X+transpose(X,12) ) ) ,12) ) +transpose(shuffle(((arpeggio(X) +((X|X) +transpose(X,-5) ) ) |echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) ) ) ,7) ) ,4) ) +transpose(transpose(((((X+transpose(X,4) ) +transpose((X|X) ,7) ) |echo(X,4,6) ) +transpose((transpose(step(transpose(X,-5) ,12) ,-7) |X) ,12) ) ,4) ,7) ) ) |(transpose(((arpeggio(arpeggio(X) ) +transpose(transpose((echo(transpose(X,-7) ,4,6) +transpose((X|X) ,-5) ) ,-5) ,7) ) +transpose(((X+transpose(transpose(X,4) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ,-5) +(step(((transpose((X+X) ,4) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose((X|X) ,7) ) ,12) ) +transpose((X+transpose(((((X+X) +transpose(X,4) ) +transpose(X,7) ) +(X|shuffle(X) ) ) ,12) ) ,12) ) ,12) |((((transpose(step(X,12) ,4) |(X+transpose(X,7) ) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) +transpose((step(((X+X) |arpeggio(X) ) ,12) +transpose((((transpose((X+X) ,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(((X|X) +transpose((X+X) ,12) ) ,7) ) ,7) ) ,4) ) +transpose(((shuffle(X) |(transpose(X,4) +X) ) +transpose(arpeggio(arpeggio(step((step(X,12) +transpose(X,12) ) ,12) ) ) ,7) ) ,7) ) ) ) ) |((step((echo(arpeggio(X) ,4,6) +transpose((X|X) ,-5) ) ,12) +transpose(echo(transpose(shuffle(transpose(transpose(X,4) ,-7) ) ,-5) ,4,6) ,-5) ) +(transpose(echo((((X+X) +transpose((X|(X|X) ) ,4) ) +transpose(((X+X) |(X+X) ) ,7) ) ,4,6) ,4) |transpose(arpeggio((X+transpose(X,12) ) ) ,-5) ) ) ) random seed used was 0
EXPR = arpeggio(echo(transpose(((step(((transpose((((X+X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,-5) +transpose(step(transpose((X|X) ,-5) ,12) ,4) ) +transpose(transpose(transpose(transpose(X,-5) ,4) ,4) ,7) ) ,12) |transpose((step(transpose(transpose(transpose(X,-5) ,-5) ,-5) ,12) |(transpose(transpose((X|X) ,-5) ,-5) +transpose((transpose(X,-7) +(arpeggio(X) +transpose(X,12) ) ) ,7) ) ) ,-5) ) |(((((((X+X) +echo(X,4,6) ) +X) +transpose(transpose(((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,7) ) ,-5) ,12) ) +((X|X) +((X+transpose(echo(X,4,6) ,4) ) +transpose(((X|X) |(X+transpose(X,7) ) ) ,7) ) ) ) +(transpose(shuffle((X|X) ) ,4) +transpose(transpose((arpeggio(transpose(X,4) ) +transpose(shuffle((X+transpose(X,7) ) ) ,7) ) ,-7) ,12) ) ) +transpose((((shuffle(X) +transpose(((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +((shuffle((X+X) ) +transpose(transpose((X|X) ,-7) ,12) ) +transpose((((X+transpose((X|X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(((step(X,12) +transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,12) ) ,12) ) ) ,7) ) ) ,4) ,4,6) ) random seed used was 0
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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