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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 19 generations the expression "X" became this: | (shuffle(((arpeggio(step(((shuffle(arpeggio(arpeggio(step(arpeggio((X|X) ) ,12) ) ) ) +transpose((((transpose(echo(arpeggio(X) ,4,6) ,4) +transpose(transpose(transpose(X,-7) ,-7) ,4) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) +transpose(step(echo(X,4,6) ,12) ,-5) ) ,12) ) |shuffle(arpeggio(arpeggio(echo(transpose(shuffle(X) ,-5) ,4,6) ) ) ) ) ,12) ) +transpose(arpeggio((transpose((((shuffle(step(step(((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ,12) ,12) ) +transpose(transpose((arpeggio(echo((X+X) ,4,6) ) +step(transpose((((X+X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,-5) ,12) ) ,-5) ,4) ) +transpose((echo(transpose(X,-5) ,4,6) +(((transpose(X,-7) +transpose((arpeggio((X|X) ) +transpose(shuffle(arpeggio(X) ) ,7) ) ,4) ) +transpose(((transpose(X,-5) |shuffle(X) ) |arpeggio(X) ) ,7) ) +transpose(((X+transpose(X,7) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,12) ) ) ,7) ) +(((step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) +transpose(echo(echo(step(echo(echo(transpose(X,-5) ,4,6) ,4,6) ,12) ,4,6) ,4,6) ,12) ) +transpose(((((echo(X,4,6) |X) |(arpeggio(step(X,12) ) |shuffle((X+transpose(X,12) ) ) ) ) +transpose(echo(arpeggio(transpose(X,4) ) ,4,6) ,-7) ) +transpose((((arpeggio(X) +transpose(step(X,12) ,4) ) +transpose(step(X,12) ,7) ) +(((X+transpose(X,4) ) +transpose(X,7) ) |transpose(echo(transpose(X,-7) ,4,6) ,-5) ) ) ,7) ) ,4) ) +transpose((arpeggio(transpose(echo(step((arpeggio(X) |X) ,12) ,4,6) ,-7) ) |(step(step(shuffle((X+transpose(shuffle(X) ,7) ) ) ,12) ,12) +step((transpose(shuffle(X) ,-7) +((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(shuffle(X) ,7) ) |step(arpeggio(X) ,12) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +arpeggio(X) ) +transpose(shuffle(echo(X,4,6) ) ,12) ) ,12) ) ) ,12) ) ) ,7) ) ) ,-7) |((((((echo(arpeggio(shuffle(X) ) ,4,6) +transpose((X+X) ,4) ) +transpose((((arpeggio(arpeggio(shuffle((step(transpose(X,4) ,12) +transpose(X,12) ) ) ) ) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose((((shuffle(X) +transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose((X+step(X,12) ) ,7) ) +((((((step(X,12) +transpose(transpose(step(X,12) ,4) ,4) ) +transpose(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(step(X,12) ,-5) ) +transpose(shuffle(((step(X,12) +transpose((X|X) ,4) ) +transpose(X,7) ) ) ,4) ) +transpose(step((X+echo(X,4,6) ) ,12) ,7) ) |((X+(step(X,12) +transpose((X|X) ,12) ) ) |transpose(step(X,12) ,4) ) ) ) ,7) ) |((step(echo(transpose(echo(shuffle((X+X) ) ,4,6) ,-5) ,4,6) ,12) +transpose(shuffle(transpose(step(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,12) ,-7) ) ,4) ) +transpose(((((((transpose(echo(X,4,6) ,-5) +transpose((step(X,12) +transpose((X+X) ,12) ) ,4) ) +transpose(echo(step((X|X) ,12) ,4,6) ,7) ) +transpose(shuffle(shuffle(transpose(X,-7) ) ) ,4) ) +transpose(shuffle(transpose((transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ) ,7) ) +transpose(echo((X|(X+X) ) ,4,6) ,4) ) +transpose(transpose(step(echo(X,4,6) ,12) ,-7) ,7) ) ,7) ) ) ,7) ) +transpose(shuffle((arpeggio(shuffle((shuffle((X+X) ) +transpose(step(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ) ) +echo(transpose(echo(((echo(X,4,6) +X) |step(X,12) ) ,4,6) ,4) ,4,6) ) ) ,4) ) +transpose(echo(transpose(transpose(step(step(echo(transpose(X,-7) ,4,6) ,12) ,12) ,-5) ,-5) ,4,6) ,7) ) +transpose(transpose(echo(echo(transpose(echo(arpeggio((step(X,12) |X) ) ,4,6) ,4) ,4,6) ,4,6) ,-5) ,4) ) +transpose((((step(((shuffle(((X+transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4) ) +transpose((X+X) ,7) ) ) +transpose(echo(shuffle(X) ,4,6) ,4) ) +transpose((X+X) ,7) ) ,12) +transpose((((echo(((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) ,4,6) +transpose(transpose(transpose(X,4) ,-5) ,7) ) +transpose(arpeggio(step((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(arpeggio((X|transpose(X,-7) ) ) ,7) ) ,12) ) |arpeggio(transpose(((transpose(X,-7) +(X+X) ) +transpose(arpeggio(X) ,7) ) ,-7) ) ) +shuffle(shuffle((((((X+X) +step(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) +transpose((transpose(transpose(X,-7) ,-7) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +X) ,12) ) ,12) ) ) ) ) ,7) ) ) ) ,4) ) +transpose(transpose((step(echo(transpose((arpeggio((X+X) ) |((((arpeggio(shuffle(X) ) +transpose(transpose(X,-5) ,7) ) +transpose(shuffle((X|X) ) ,4) ) +transpose(shuffle(transpose(X,4) ) ,7) ) +transpose(step(transpose(shuffle(((X+transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,-5) ,12) ,12) ) ) ,-7) ,4,6) ,12) +step(transpose((step(transpose(step(((X|transpose(X,-5) ) |X) ,12) ,4) ,12) +transpose((arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,4) ) ,7) ) ,-7) ,12) ) ,-7) ,7) ) ) |step(transpose((((arpeggio(shuffle(step(step((((echo(X,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose(transpose(arpeggio(X) ,-5) ,7) ) ,12) ,12) ) ) +transpose(transpose(step((((X+transpose(X,4) ) +transpose(X,7) ) +(X|transpose((X+X) ,-5) ) ) ,12) ,-7) ,4) ) +transpose(shuffle(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) +transpose(((X|X) +transpose((X+X) ,12) ) ,4) ) ,4) ) ,7) ) |step(shuffle(shuffle(((transpose(shuffle(X) ,-5) +transpose(echo(((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) ,4,6) ,4) ) +transpose((((transpose(X,-5) +(X|X) ) +transpose((shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ) ) ,12) ) ,-5) ,12) ) random seed used was 245759902
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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