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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((arpeggio(shuffle(transpose(((((transpose(echo(X,4,6) ,-7) +transpose(echo(((X|echo(X,4,6) ) +echo(arpeggio(X) ,4,6) ) ,4,6) ,7) ) +transpose((((X|arpeggio(X) ) +transpose((((X+transpose(X,7) ) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(((X+transpose(arpeggio(X) ,12) ) |(shuffle(X) +transpose(step(X,12) ,12) ) ) ,7) ) ,7) ) +transpose(transpose((((X+transpose((X+transpose(X,12) ) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(echo(step(X,12) ,4,6) ,7) ) ,4) ,12) ) ,12) ) +transpose(transpose(((echo(((transpose(X,-5) +transpose(step(arpeggio(X) ,12) ,4) ) +transpose(arpeggio(step(X,12) ) ,7) ) ,4,6) +transpose((transpose(echo((X+transpose(X,7) ) ,4,6) ,-7) +(transpose(X,-7) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ) ) ,4) ) +transpose(transpose(shuffle(transpose(((arpeggio(transpose(X,4) ) +transpose(X,4) ) +transpose((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,-7) ) ,4) ,7) ) ,-7) ,12) ) +transpose(((transpose((shuffle(transpose((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(step(((echo((X+transpose(X,7) ) ,4,6) +transpose(transpose(X,-7) ,4) ) +transpose((shuffle(X) +transpose((X+X) ,7) ) ,7) ) ,12) ,12) ) ,-5) +transpose(echo(step(transpose(arpeggio((transpose(arpeggio(transpose(X,-7) ) ,-7) +((shuffle(X) +transpose(X,12) ) |transpose(transpose(X,4) ,-7) ) ) ) ,-5) ,12) ,4,6) ,4) ) +transpose(((transpose((transpose(((((echo(X,4,6) +transpose((transpose(X,-7) +transpose(transpose(X,4) ,12) ) ,12) ) +transpose((((X+transpose(X,7) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ,12) ) +transpose(((((echo(X,4,6) +transpose(transpose(arpeggio(X) ,-7) ,4) ) +transpose((transpose(X,-7) +transpose(X,12) ) ,7) ) +transpose(((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(((((X+transpose(X,12) ) +transpose(X,7) ) +transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ,4) ) +transpose(transpose((shuffle(X) |(arpeggio(X) +transpose(X,-7) ) ) ,-5) ,7) ) ,4) +transpose(transpose(X,-7) ,12) ) ,-7) +transpose(arpeggio(transpose(step(shuffle((transpose(transpose(X,-7) ,-7) +arpeggio(transpose(X,-7) ) ) ) ,12) ,-7) ) ,4) ) +transpose(arpeggio((((transpose(((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose((X|X) ,7) ) ,4) +((X+transpose((X+transpose(X,12) ) ,7) ) +(X+transpose(X,7) ) ) ) +transpose(transpose(arpeggio(X) ,4) ,4) ) +transpose(transpose(transpose((transpose(X,4) +arpeggio(X) ) ,-7) ,-7) ,7) ) ) ,7) ) ,7) ) ,12) ) ,-7) ) ) +step(shuffle(step(((((transpose(arpeggio(((transpose((echo(arpeggio(X) ,4,6) |(X|X) ) ,-5) +transpose((transpose(transpose(X,-7) ,-5) +echo(arpeggio(((X+transpose(transpose(X,-7) ,12) ) +transpose(echo(X,4,6) ,12) ) ) ,4,6) ) ,4) ) +transpose(transpose((shuffle((X+transpose(X,12) ) ) |echo(X,4,6) ) ,-7) ,7) ) ) ,4) +transpose(shuffle((((transpose((X+X) ,4) +((echo(X,4,6) +transpose(X,7) ) +transpose(arpeggio((X|X) ) ,12) ) ) +transpose(((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +echo(((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ) +transpose(step(transpose((((X+transpose((X+transpose(X,12) ) ,12) ) +transpose((arpeggio(X) +transpose((X+X) ,12) ) ,4) ) +transpose((X+echo(X,4,6) ) ,7) ) ,4) ,12) ,12) ) ,4) ) +transpose((step(((X|X) +transpose((X+X) ,12) ) ,12) |(((X+transpose(X,7) ) +(X+X) ) +transpose(transpose(transpose(X,-7) ,-7) ,7) ) ) ,7) ) ) ,4) ) +transpose(echo((((shuffle(echo(X,4,6) ) +transpose((step(echo(transpose(X,4) ,4,6) ,12) +((X+transpose(X,7) ) |step(echo(transpose(X,-7) ,4,6) ,12) ) ) ,12) ) +transpose(transpose(((X+X) +echo(X,4,6) ) ,4) ,12) ) +transpose(shuffle((step(transpose((X+transpose(X,7) ) ,4) ,12) +transpose(((X|X) +transpose((X|transpose(X,-5) ) ,12) ) ,7) ) ) ,-7) ) ,4,6) ,7) ) +transpose(transpose((((transpose(step((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(arpeggio(transpose(transpose(X,4) ,-7) ) ,7) ) ,12) ,-7) +transpose(((transpose(transpose((X|X) ,-5) ,-7) +transpose(echo((((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose(shuffle((X+X) ) ,4) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,4,6) ,12) ) +transpose(transpose(transpose(shuffle(echo((transpose(X,-7) +transpose(((echo(X,4,6) +transpose(transpose(X,-7) ,4) ) +transpose((X|X) ,7) ) ,12) ) ,4,6) ) ,-7) ,4) ,7) ) ,12) ) +transpose(((arpeggio(step(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) +transpose((((X+transpose(X,7) ) +transpose(transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(echo((transpose(shuffle(arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ) ) ,-7) +transpose(arpeggio(transpose(arpeggio(transpose(X,-7) ) ,4) ) ,7) ) ,4,6) ,12) ) ,4) ) +transpose(transpose(((step(echo(arpeggio(X) ,4,6) ,12) +transpose((X+transpose(X,7) ) ,12) ) +(((echo(transpose(X,4) ,4,6) +transpose(arpeggio(X) ,4) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) +transpose(((X+echo(X,4,6) ) +transpose((transpose(X,4) +transpose((X+transpose(X,7) ) ,7) ) ,12) ) ,12) ) ) ,-5) ,7) ) ,4) ,7) ) +(((echo(transpose(shuffle(X) ,-5) ,4,6) +transpose(step(echo(((((step(X,12) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose(((X+transpose(X,12) ) |X) ,7) ) +transpose(X,4) ) +transpose((transpose(X,4) +transpose(X,12) ) ,7) ) ,4,6) ,12) ,7) ) +transpose(arpeggio(((echo(echo(X,4,6) ,4,6) +transpose(transpose((transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,-7) |(transpose(arpeggio(X) ,-5) |X) ) ,-7) ,12) ) +transpose(step(arpeggio(echo(echo(transpose(transpose(X,-7) ,-7) ,4,6) ,4,6) ) ,12) ,12) ) ) ,7) ) |(arpeggio(transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(transpose((transpose(X,4) +transpose(transpose((X+transpose(X,7) ) ,-5) ,7) ) ,-7) ,12) ) ,4) ) +transpose(transpose(echo(transpose((step((X+transpose(X,-5) ) ,12) +transpose(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,-7) ,12) ) ,-7) ,4,6) ,-7) ,12) ) ) ) ,12) ) ,12) ) ,-7) random seed used was 236382467
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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