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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: | ((step(echo(echo(shuffle(transpose(transpose(transpose(step(transpose(transpose((arpeggio(step(X,12) ) +transpose(step((step(X,12) +transpose(X,7) ) ,12) ,12) ) ,-7) ,4) ,12) ,4) ,4) ,4) ) ,4,6) ,4,6) ,12) +transpose(((transpose(echo(shuffle(arpeggio(transpose(X,4) ) ) ,4,6) ,-7) |echo((((((((((X+transpose((X+X) ,7) ) +step(X,12) ) +transpose(((arpeggio(X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4) ) +transpose((transpose(shuffle(X) ,-5) |(X|arpeggio(X) ) ) ,7) ) |((step(X,12) |X) |((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ) +transpose((((echo(shuffle((X+transpose(X,12) ) ) ,4,6) +transpose(arpeggio(echo(step(X,12) ,4,6) ) ,4) ) +transpose(transpose(shuffle(X) ,-5) ,7) ) +transpose(((((X+transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(((X|X) +shuffle(X) ) ,12) ) ,7) ) ,7) ) ,4) ) +transpose(echo(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4,6) ,7) ) +echo(((shuffle(shuffle(X) ) +transpose(arpeggio(shuffle((X+X) ) ) ,7) ) +transpose((shuffle(arpeggio(X) ) |echo(transpose(X,-7) ,4,6) ) ,12) ) ,4,6) ) +transpose(arpeggio(echo(((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ) ,7) ) ,4,6) ) +transpose(step(echo(arpeggio(shuffle(shuffle(arpeggio((arpeggio(((step(X,12) +transpose((echo(X,4,6) +step(X,12) ) ,4) ) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ) ,7) ) ) +((arpeggio(X) |X) |step(step(transpose(X,-5) ,12) ,12) ) ) ) ) ) ) ,4,6) ,12) ,7) ) ,4) ) +transpose(echo(shuffle(((echo((echo(echo((shuffle((((X|step(X,12) ) +transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) ) +transpose((((transpose(echo((X+transpose(X,12) ) ,4,6) ,4) +transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) +transpose(echo(X,4,6) ,7) ) +(transpose(shuffle(arpeggio(X) ) ,4) |echo(X,4,6) ) ) ,7) ) ,4,6) ,4,6) +arpeggio(arpeggio((shuffle(((echo(X,4,6) +transpose(echo((arpeggio(transpose(X,-7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,4) ) +transpose(((arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) |X) ) +transpose(step(transpose(X,-7) ,12) ,4) ) +transpose(echo(((transpose(X,-5) +transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ,7) ) ,7) ) ) +transpose(arpeggio(((X|(X+transpose(X,12) ) ) +transpose(shuffle(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) ,-7) ) ) ,7) ) ) ) ) ,4,6) |(((shuffle((echo(transpose(((echo(((X|X) +transpose(X,7) ) ,4,6) +transpose((echo(X,4,6) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ,-7) ,4,6) +shuffle((((((((step(X,12) +shuffle(X) ) +transpose(shuffle((X+transpose(X,12) ) ) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) +transpose(arpeggio(shuffle(echo(X,4,6) ) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(arpeggio((X+X) ) ,-7) ,4) ) +transpose(echo(transpose(transpose(X,-7) ,4) ,4,6) ,7) ) ) ) ) +transpose(transpose((transpose(transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(step(X,12) ,7) ) +transpose((((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +echo((((X+transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4,6) ) ,4) ) +transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,12) ,7) ) +transpose(transpose((((shuffle(X) +transpose(shuffle(echo(X,4,6) ) ,7) ) +transpose(step(transpose(X,4) ,12) ,4) ) +transpose(transpose((arpeggio(X) +X) ,-5) ,7) ) ,-5) ,7) ) ,-7) ,-5) +transpose(echo(transpose(transpose((transpose(X,-7) |X) ,-5) ,4) ,4,6) ,-5) ) ,4) ,12) ) +transpose(transpose(echo(echo(shuffle(step((((step(((X+X) +X) ,12) +transpose(shuffle(step(X,12) ) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) +transpose(echo(echo(transpose(X,4) ,4,6) ,4,6) ,12) ) ,12) ) ,4,6) ,4,6) ,-7) ,12) ) +((((((arpeggio(arpeggio(X) ) +shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-5) ) ) ) +transpose(step(transpose((X|arpeggio(X) ) ,-7) ,12) ,4) ) +transpose((((transpose(X,4) +X) +shuffle(X) ) +transpose(step(X,12) ,-5) ) ,7) ) +transpose(transpose(arpeggio(arpeggio(arpeggio(X) ) ) ,4) ,12) ) +(transpose((X+transpose(echo(arpeggio(echo(X,4,6) ) ,4,6) ,7) ) ,4) +step(arpeggio((X+arpeggio(X) ) ) ,12) ) ) +transpose(transpose(transpose(echo(echo(((X+transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4) ) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4,6) ,4,6) ,4) ,4) ,4) ) ) ) +transpose(((step(shuffle(shuffle(shuffle(step(((arpeggio((arpeggio(step(X,12) ) +X) ) |shuffle(transpose(transpose((X+X) ,4) ,-7) ) ) +transpose(((step(step(arpeggio((X+transpose(X,12) ) ) ,12) ,12) +transpose((echo(X,4,6) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ) ,12) ) ) ) ,12) +transpose(transpose((echo(transpose(arpeggio(echo(echo((echo(shuffle(X) ,4,6) +transpose(((transpose(X,4) +transpose(transpose(X,-7) ,7) ) |(step(X,12) +shuffle(X) ) ) ,7) ) ,4,6) ,4,6) ) ,4) ,4,6) +transpose((transpose(transpose(step((X|X) ,12) ,-5) ,4) +transpose(step(echo(transpose(X,-7) ,4,6) ,12) ,4) ) ,7) ) ,-7) ,4) ) +transpose(((((transpose(arpeggio(transpose(arpeggio(((transpose(X,-5) +transpose(arpeggio(transpose(X,4) ) ,4) ) +transpose(((X+X) |X) ,7) ) ) ,-5) ) ,-5) |transpose((X+transpose(echo(step(X,12) ,4,6) ,7) ) ,4) ) +(arpeggio(transpose(X,-5) ) +step((transpose(echo(X,4,6) ,4) +transpose(transpose(shuffle(step(X,12) ) ,-7) ,7) ) ,12) ) ) +transpose((echo(echo(echo(step(step(transpose(X,-7) ,12) ,12) ,4,6) ,4,6) ,4,6) +transpose(((step((shuffle(echo(step(echo(arpeggio(X) ,4,6) ,12) ,4,6) ) +transpose(arpeggio(transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ) ,12) ) ,12) +transpose(echo(transpose(X,-7) ,4,6) ,4) ) +transpose(((transpose(shuffle((transpose(X,-7) |X) ) ,4) |echo(transpose(X,4) ,4,6) ) +((transpose(((arpeggio((shuffle(X) +transpose(X,12) ) ) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,4) ) +transpose(step(arpeggio(transpose(X,4) ) ,12) ,7) ) ,-5) +transpose(arpeggio(echo(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ) ,4) ) +transpose((echo(X,4,6) +shuffle(X) ) ,7) ) ) ,7) ) ,12) ) ,12) ) |transpose(shuffle(((step(transpose((X|(shuffle(echo(X,4,6) ) +shuffle((X+X) ) ) ) ,-5) ,12) +transpose(arpeggio(((arpeggio((step(X,12) |((shuffle(X) +transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(transpose(X,4) ,4) ) +transpose((step(transpose(X,-7) ,12) +transpose((echo(step((X+X) ,12) ,4,6) |echo(shuffle(X) ,4,6) ) ,12) ) ,7) ) ) ,4) ) +transpose((transpose((((transpose(echo(X,4,6) ,-5) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) ,-5) +transpose(((echo(arpeggio((X+transpose(X,12) ) ) ,4,6) +transpose(echo((transpose(X,4) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,4) ) +transpose(transpose(transpose(transpose(X,-7) ,4) ,-7) ,7) ) ,7) ) ,7) ) ) ,-7) ) ,7) ) ,12) ) ) ,4,6) ,7) ) random seed used was 187977150
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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