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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 14 generations the expression "X" became this: | transpose(arpeggio(transpose((echo(transpose(shuffle(X) ,-7) ,4,6) +transpose(transpose(step(transpose(arpeggio((X+transpose(X,12) ) ) ,-5) ,12) ,-5) ,12) ) ,-5) ) ,-5) random seed used was 253104058
EXPR = shuffle((((((transpose(transpose((((((step((echo(X,4,6) +transpose(X,7) ) ,12) +transpose(transpose(X,4) ,4) ) +transpose(echo(transpose(transpose(X,-5) ,4) ,4,6) ,7) ) +transpose(transpose(((X+transpose(transpose(X,4) ,12) ) +transpose(shuffle(step(X,12) ) ,7) ) ,-5) ,4) ) +transpose((X+transpose(echo(X,4,6) ,12) ) ,7) ) +transpose(X,-7) ) ,4) ,4) +transpose(echo(((((step(echo((X|transpose(X,-5) ) ,4,6) ,12) |arpeggio(transpose((X+transpose(X,7) ) ,4) ) ) +transpose(((transpose(X,-7) +echo(transpose(X,4) ,4,6) ) |arpeggio(X) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((step(echo(X,4,6) ,12) +((X+transpose(X,7) ) +transpose(X,7) ) ) ,12) ) ,4,6) ,12) ) |shuffle((((((transpose(shuffle((step(X,12) +transpose((X+X) ,12) ) ) ,-7) +shuffle((echo((X+X) ,4,6) +transpose(X,4) ) ) ) +transpose(transpose((echo(X,4,6) |echo(X,4,6) ) ,4) ,4) ) +transpose(step(echo(X,4,6) ,12) ,7) ) +transpose(((transpose(arpeggio(transpose(transpose(X,-7) ,4) ) ,-5) +transpose(transpose(transpose(((X+transpose(X,7) ) |transpose(X,-7) ) ,4) ,-7) ,4) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-7) ,7) ) ,4) ) +transpose(((transpose(transpose(X,-5) ,-5) +transpose(transpose(((X|X) +transpose(transpose(X,-7) ,7) ) ,4) ,4) ) +transpose(transpose(echo(((transpose(X,4) +transpose(transpose(X,4) ,7) ) |(transpose(X,-7) +transpose(X,12) ) ) ,4,6) ,4) ,7) ) ,7) ) ) ) +transpose((((((((((shuffle(((step(X,12) +transpose(X,12) ) +transpose(X,-7) ) ) +transpose(transpose(step(X,12) ,-7) ,7) ) +transpose(((shuffle(transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(X,12) ) ,4) ) +transpose((step(((shuffle(transpose(X,4) ) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) |(transpose(transpose(transpose(X,4) ,-5) ,-5) +transpose(transpose((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,-5) ,12) ) ) ,7) ) |arpeggio(transpose(transpose(shuffle((X+transpose((X+X) ,12) ) ) ,-5) ,-5) ) ) +transpose(((((arpeggio(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) +transpose((shuffle(((X|X) |transpose(X,-5) ) ) |(((transpose(X,-5) +transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(X,12) ) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,7) ) |(step((transpose(X,4) |transpose(X,-5) ) ,12) +(transpose((X|X) ,-7) |(X|X) ) ) ) +transpose(transpose(transpose(((((X+transpose(X,12) ) +shuffle(X) ) +X) +transpose((X|X) ,12) ) ,4) ,-5) ,7) ) ,4) ) +transpose(shuffle((((X|X) +transpose(echo(((X|X) +transpose(X,12) ) ,4,6) ,7) ) +transpose((transpose((((X+transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(shuffle(X) ,7) ) ,-5) +transpose((transpose(X,4) +transpose(shuffle(shuffle(X) ) ,7) ) ,12) ) ,7) ) ) ,7) ) +transpose(shuffle(step(transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ,12) ) ,4) ) +transpose((shuffle(echo(transpose(shuffle(transpose((X+transpose(X,7) ) ,4) ) ,-7) ,4,6) ) +shuffle(transpose(echo((X+X) ,4,6) ,-7) ) ) ,7) ) +transpose((transpose(((transpose((step((X|X) ,12) +echo(echo(X,4,6) ,4,6) ) ,-7) +transpose(shuffle(transpose((step(((X+transpose(X,12) ) +transpose(X,7) ) ,12) |((X+transpose(transpose(X,4) ,12) ) +transpose(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,12) ) ) ,-7) ) ,4) ) +transpose(((((((X|X) +shuffle(X) ) |((X+transpose(X,12) ) +shuffle(echo(X,4,6) ) ) ) +transpose(shuffle((X+X) ) ,4) ) +transpose(transpose((echo(X,4,6) +shuffle(X) ) ,4) ,7) ) |((transpose(transpose(X,-5) ,4) +transpose((((X|X) +transpose((X|X) ,4) ) +transpose(X,7) ) ,12) ) |transpose(transpose(transpose(X,4) ,4) ,4) ) ) ,7) ) ,-5) +transpose((((arpeggio(echo(((X|X) +transpose(transpose(X,4) ,7) ) ,4,6) ) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,-5) ,4) ) +transpose((transpose(X,4) +shuffle(X) ) ,7) ) +transpose(transpose(((shuffle((X|X) ) +transpose(shuffle(transpose(X,-7) ) ,7) ) +transpose(((transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) ,-7) +transpose((transpose(X,4) +transpose((X|echo(X,4,6) ) ,12) ) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ,12) ) ,-7) ,7) ) ,7) ) ,7) ) ,4) ) +transpose(((transpose(((((X+transpose(X,-5) ) |transpose(transpose(X,-7) ,-7) ) +transpose(((transpose(X,-5) +transpose((X|(X|X) ) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) ,4) ) +transpose(transpose(((X|X) +transpose((X|(X|X) ) ,12) ) ,-7) ,7) ) ,-5) +transpose((((transpose(shuffle(arpeggio(X) ) ,-7) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose((shuffle(transpose((X+transpose(X,7) ) ,4) ) +transpose(shuffle(X) ,-5) ) ,12) ) ,7) ) +transpose(transpose(shuffle(echo(transpose(((transpose(X,-7) |(X+transpose(X,7) ) ) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ,-7) ,4,6) ) ,-5) ,7) ) ,7) ) |transpose(transpose(shuffle((shuffle(arpeggio(transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,-5) ) ) +transpose(transpose((transpose(shuffle(X) ,-5) +transpose(step(((((X+transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) +transpose((shuffle(X) +transpose((X+X) ,7) ) ,12) ) ,12) ,12) ) ,4) ,12) ) ) ,4) ,4) ) ) random seed used was 0
EXPR = step(transpose(transpose((echo(arpeggio((X+transpose(shuffle(X) ,-5) ) ) ,4,6) +transpose(((shuffle(((shuffle(X) +transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) +transpose((echo(X,4,6) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ,12) ) ,4) ) +transpose(transpose(shuffle(((shuffle(((X+transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) ) +(shuffle(X) +X) ) +transpose(echo((transpose(X,-5) |(X+X) ) ,4,6) ,12) ) ) ,4) ,7) ) ,7) ) ,-7) ,-5) ,12) 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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