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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(transpose(arpeggio(transpose(transpose(shuffle((transpose(transpose(X,-5) ,-7) +arpeggio(X) ) ) ,-5) ,4) ) ,-5) ,-7) ) |(shuffle(transpose(step(echo((transpose(transpose(((X+X) +transpose(X,12) ) ,-7) ,-5) +transpose(transpose(transpose(((transpose((X+transpose(X,7) ) ,-7) +transpose((transpose(X,-5) +transpose(step(X,12) ,12) ) ,12) ) +transpose(step(transpose(X,-5) ,12) ,7) ) ,-7) ,4) ,12) ) ,4,6) ,12) ,-5) ) +transpose(arpeggio(echo((((((transpose((shuffle(((step(X,12) +transpose(step(transpose(X,-7) ,12) ,12) ) +transpose((X+transpose(X,-5) ) ,-7) ) ) +transpose((((X+transpose(X,-7) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(transpose(transpose(X,-7) ,-5) ,-5) ,12) ) ,12) ) ,-5) +transpose(transpose((transpose(((X+(transpose(X,-5) +transpose((X+transpose(X,12) ) ,7) ) ) |(X+transpose(transpose(X,4) ,7) ) ) ,-7) +transpose((transpose(X,4) +transpose(X,12) ) ,7) ) ,-7) ,12) ) +transpose((((arpeggio((X+transpose(step(X,12) ,7) ) ) +transpose(transpose((shuffle(X) +transpose(transpose(X,-7) ,12) ) ,-5) ,4) ) +transpose(transpose(shuffle(transpose((X+transpose(shuffle(X) ,12) ) ,4) ) ,-7) ,7) ) |(transpose((shuffle(transpose(transpose(X,-5) ,-7) ) +transpose((transpose(step(X,12) ,-7) +transpose(((arpeggio(X) +transpose(shuffle(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ) ,12) ) ,4) +transpose((X+transpose(echo(((((transpose((X|X) ,-5) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose((arpeggio(X) |transpose(step(X,12) ,-5) ) ,7) ) +transpose(X,12) ) ,4,6) ,12) ) ,12) ) ) ,4) ) +transpose(step(transpose((shuffle((echo(shuffle(X) ,4,6) +transpose(((X+X) +transpose(X,12) ) ,12) ) ) +transpose(transpose(transpose(arpeggio(X) ,-5) ,-5) ,7) ) ,-7) ,12) ,7) ) +transpose((echo(step(transpose((transpose(echo(shuffle(X) ,4,6) ,-5) |arpeggio(transpose(X,4) ) ) ,4) ,12) ,4,6) +transpose(transpose((((shuffle(transpose(X,-5) ) +transpose(((transpose(X,-5) |X) +transpose(transpose(((X+X) +transpose(transpose(X,4) ,12) ) ,-5) ,7) ) ,4) ) +transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(((X+transpose((X+transpose(X,7) ) ,12) ) +transpose((X+transpose(shuffle(X) ,12) ) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) |shuffle((transpose(arpeggio(X) ,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,-7) ,12) ) ,7) ) +transpose(transpose(echo(((transpose(X,-7) +transpose(shuffle(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,12) ) +transpose(step((shuffle(X) +transpose(arpeggio(transpose(X,-7) ) ,12) ) ,12) ,12) ) ,4,6) ,-5) ,12) ) ,4,6) ) ,12) ) ) +transpose(echo(((((((transpose((transpose(X,-7) +transpose(transpose(X,-5) ,7) ) ,-7) +transpose((echo(transpose((((X+transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ,4,6) |((echo(shuffle(echo(X,4,6) ) ,4,6) +transpose(transpose(transpose(step((X|X) ,12) ,-7) ,-7) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose((X+transpose(arpeggio(X) ,7) ) ,-7) ,7) ) ,7) ) ) ,7) ) +echo(echo(shuffle(transpose(transpose(shuffle(X) ,4) ,-5) ) ,4,6) ,4,6) ) +transpose(transpose(step(echo((arpeggio(((((transpose(transpose(X,-7) ,-7) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,4) ,7) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) |((echo(arpeggio(((step(X,12) +transpose(shuffle(echo(X,4,6) ) ,4) ) +transpose(((echo(arpeggio(X) ,4,6) +transpose(arpeggio((X+X) ) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ) ,4,6) +transpose(step((X+transpose(transpose(X,4) ,7) ) ,12) ,4) ) +transpose(transpose(arpeggio(transpose(X,-7) ) ,-7) ,7) ) ) ) +transpose((((transpose((transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,-7) |transpose(X,-7) ) ,-5) +transpose(((transpose(arpeggio(echo(X,4,6) ) ,-7) +transpose(shuffle(transpose(X,-5) ) ,7) ) +(echo(step(X,12) ,4,6) +transpose((X|(X+transpose(X,12) ) ) ,7) ) ) ,12) ) +transpose((transpose(X,-5) +transpose(shuffle(echo((X+transpose(X,7) ) ,4,6) ) ,7) ) ,4) ) +transpose(transpose(echo(((((X+X) +transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) |transpose((X+transpose(X,7) ) ,4) ) ,4,6) ,-7) ,7) ) ,12) ) ,4,6) ,12) ,-7) ,4) ) +transpose(step((echo((transpose(transpose(shuffle(transpose((X+transpose(X,12) ) ,-5) ) ,-5) ,-7) +(transpose(transpose(arpeggio((X+transpose(X,12) ) ) ,-7) ,-5) |((((transpose(transpose(X,-7) ,-7) +transpose((transpose(X,-5) +transpose(((X+transpose(X,12) ) |(X|X) ) ,7) ) ,7) ) +transpose((X+transpose(transpose(X,-7) ,7) ) ,12) ) +echo(echo(shuffle(X) ,4,6) ,4,6) ) |transpose((transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ,-5) +transpose(transpose(transpose(step(X,12) ,4) ,-7) ,12) ) ,-5) ) ) ) ,4,6) +transpose(((transpose(step(transpose(shuffle(X) ,-7) ,12) ,-7) +transpose((echo(transpose(transpose((((X+transpose(X,12) ) |X) +transpose((echo(X,4,6) |(X+transpose(X,7) ) ) ,12) ) ,4) ,-7) ,4,6) +transpose(step(((transpose(((X+transpose(X,12) ) +transpose(transpose(X,-7) ,7) ) ,-7) +transpose((arpeggio(X) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ,7) ) +transpose(((arpeggio(transpose(X,-5) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) ,7) ) ,12) ,12) ) ,7) ) +transpose((((((X+X) |X) +transpose(arpeggio(transpose(X,-5) ) ,12) ) +arpeggio(transpose(X,4) ) ) |((transpose(X,-5) +transpose((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) ,12) ) +transpose(transpose(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-7) ,12) ) ) ,7) ) ,12) ) ,12) ,7) ) +shuffle(echo(((step(transpose((shuffle(step(transpose(transpose(X,-5) ,-7) ,12) ) |transpose((transpose(X,-7) |shuffle(X) ) ,-5) ) ,-5) ,12) +transpose(shuffle(shuffle(step(transpose(echo(X,4,6) ,-5) ,12) ) ) ,4) ) +transpose(transpose(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose(step(X,12) ,7) ) ,12) ,4) ,7) ) ,4,6) ) ) +transpose((shuffle(echo(step(transpose(transpose(transpose((transpose(shuffle(transpose(shuffle(X) ,-5) ) ,-7) |echo(((X+transpose(X,12) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ,4,6) ) ,-5) ,-7) ,-7) ,12) ,4,6) ) |transpose(arpeggio(transpose((step(((((transpose(step((X+X) ,12) ,-5) +transpose(arpeggio(X) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) +transpose(transpose((transpose(X,-7) +step(X,12) ) ,-5) ,4) ) +transpose(transpose(X,4) ,7) ) ,12) +transpose(arpeggio(((step(((transpose(transpose(echo(echo(X,4,6) ,4,6) ,4) ,-7) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) |((transpose((X|X) ,4) +transpose(((X|X) +arpeggio(X) ) ,12) ) +transpose(shuffle(transpose(((X+X) +transpose((X+X) ,12) ) ,-5) ) ,12) ) ) ,12) +(((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((transpose((((X+transpose(X,7) ) +transpose(((X+X) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(step(transpose(X,-7) ,12) ,7) ) ,-7) +transpose(shuffle(transpose((X+transpose(X,12) ) ,-5) ) ,7) ) ,7) ) ) +transpose((echo(transpose(X,-5) ,4,6) +transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,12) ) ,7) ) ) ,7) ) ,4) ) ,-5) ) ,7) ) ,4,6) ,12) ) ,-7) random seed used was 233324545
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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