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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: | (arpeggio(step(((transpose(transpose(step(transpose(arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,-5) ,12) ,-5) ,-7) +transpose(echo(echo(echo((transpose(X,-5) +transpose(X,12) ) ,4,6) ,4,6) ,4,6) ,4) ) +transpose(step(echo(echo(step(echo((echo(X,4,6) +transpose((shuffle(X) +X) ,7) ) ,4,6) ,12) ,4,6) ,4,6) ,12) ,7) ) ,12) ) +transpose(((echo(((echo(transpose(arpeggio(echo(X,4,6) ) ,-5) ,4,6) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) |(((echo((((shuffle(shuffle(X) ) +transpose((echo(X,4,6) +transpose(X,12) ) ,4) ) +transpose(X,7) ) +transpose(((X+transpose((X+transpose(X,12) ) ,7) ) +(X+transpose((X+X) ,7) ) ) ,7) ) ,4,6) |(((echo(((shuffle(X) +step(X,12) ) +transpose(arpeggio(X) ,7) ) ,4,6) +transpose(arpeggio(X) ,4) ) +transpose(step(X,12) ,7) ) |arpeggio(step(X,12) ) ) ) +transpose((((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) |arpeggio(echo((X+X) ,4,6) ) ) +transpose(arpeggio(transpose(X,-7) ) ,12) ) +transpose((((step(step(arpeggio(X) ,12) ,12) +transpose(transpose((X+shuffle(X) ) ,-7) ,7) ) +transpose((((step(X,12) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(step((X+transpose(X,12) ) ,12) ,4) ,7) ) ,7) ) ,4) ) +transpose(transpose((transpose(transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,-7) ,-5) +transpose(arpeggio((transpose(transpose(X,-5) ,4) +transpose((X+arpeggio(X) ) ,7) ) ) ,7) ) ,-7) ,7) ) ) ,4,6) +transpose(echo((transpose(((echo(arpeggio((X+transpose(X,12) ) ) ,4,6) +transpose(shuffle(((arpeggio((X+transpose(arpeggio(X) ,7) ) ) +transpose(echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ,4) ) +transpose((((((X+X) +transpose(X,12) ) +transpose((X|transpose(X,-7) ) ,7) ) +transpose(transpose((X+transpose((X+transpose(X,7) ) ,12) ) ,4) ,4) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,7) ) ,7) ) ) ,7) ) +transpose(transpose(transpose(echo(((X+X) +shuffle(X) ) ,4,6) ,-5) ,-7) ,12) ) ,-5) +transpose(((echo(((echo(X,4,6) +transpose((X+transpose(X,7) ) ,12) ) |transpose(transpose(X,-7) ,-7) ) ,4,6) +echo(echo(step(shuffle(X) ,12) ,4,6) ,4,6) ) +transpose(((arpeggio((arpeggio(step((transpose(step(X,12) ,4) |transpose((X+transpose(X,12) ) ,-5) ) ,12) ) +transpose((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,12) ) ) +transpose(((((step(X,12) +transpose(((X|(X+transpose(X,12) ) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,7) ) +step((step(X,12) +transpose((step(X,12) +transpose(X,12) ) ,7) ) ,12) ) +transpose(shuffle(echo(echo(shuffle(X) ,4,6) ,4,6) ) ,7) ) +transpose((echo(echo(((X+transpose(X,7) ) |transpose((X+transpose(X,12) ) ,-5) ) ,4,6) ,4,6) +transpose(arpeggio((X+X) ) ,-7) ) ,12) ) ,4) ) +transpose((shuffle(X) +transpose((((X+transpose(X,12) ) +transpose((transpose(X,-7) +echo(X,4,6) ) ,7) ) +transpose(X,7) ) ,12) ) ,7) ) ,12) ) ,7) ) ,4,6) ,4) ) +transpose(((((shuffle(transpose((transpose((X|X) ,4) +transpose(transpose(shuffle(((X|X) +X) ) ,4) ,7) ) ,-7) ) +transpose(transpose((transpose(((((X+transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(shuffle(X) ,7) ) +transpose(transpose(arpeggio(X) ,-7) ,12) ) ,4) +transpose((echo((((X+transpose(X,7) ) +transpose(((step((X+transpose(X,7) ) ,12) +transpose((X|(X+transpose(X,12) ) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ,4,6) +arpeggio(arpeggio((X+transpose(X,7) ) ) ) ) ,7) ) ,4) ,12) ) +transpose(((shuffle((X+transpose(X,12) ) ) +transpose((transpose(X,-5) +transpose(shuffle(transpose(echo(X,4,6) ,-5) ) ,12) ) ,7) ) +transpose(((((step(X,12) +transpose(transpose(X,4) ,12) ) +transpose(((transpose(shuffle(X) ,4) +transpose((((X|X) +transpose(X,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) +transpose(echo((transpose(X,4) +transpose((X+transpose(X,7) ) ,12) ) ,4,6) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) +transpose((((X+transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,12) ) ,12) ) ,4) ) +transpose(transpose(((((X+X) +transpose((X+transpose(X,12) ) ,12) ) +transpose(((echo(X,4,6) +transpose((X+transpose(X,7) ) ,7) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,7) ) +transpose(transpose(((((X+X) +transpose(X,12) ) +transpose(X,4) ) +transpose(shuffle((X+transpose(X,12) ) ) ,7) ) ,-7) ,7) ) ,-5) ,7) ) +transpose(((step(((X+transpose(step(X,12) ,4) ) +transpose(arpeggio((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) ) ,7) ) ,12) +((((echo((X+transpose(X,12) ) ,4,6) +transpose(((shuffle(X) +transpose((X+X) ,4) ) +transpose(X,7) ) ,12) ) +transpose(shuffle(((X+(X+transpose(X,7) ) ) +transpose(transpose(arpeggio(X) ,4) ,7) ) ) ,7) ) +transpose(echo(transpose((echo(X,4,6) +X) ,4) ,4,6) ,4) ) +transpose((arpeggio(transpose(X,-5) ) +step(arpeggio(arpeggio(X) ) ,12) ) ,7) ) ) +transpose((shuffle(transpose(shuffle((echo(step(X,12) ,4,6) +transpose((transpose((X+transpose(X,7) ) ,-7) +transpose(((X|X) +shuffle(X) ) ,7) ) ,12) ) ) ,4) ) |shuffle(((((transpose(arpeggio(X) ,4) +transpose(X,12) ) +transpose((((arpeggio(X) +step(X,12) ) +transpose(((X|X) +transpose(X,12) ) ,4) ) +transpose(X,7) ) ,7) ) +transpose((step(transpose((X+transpose(X,7) ) ,4) ,12) |transpose(step((((X|X) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ,12) ,4) ) ,7) ) |transpose(((((X+transpose(X,12) ) +transpose(X,7) ) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,12) ) +transpose(((arpeggio(X) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(((shuffle(X) +transpose(X,12) ) +transpose((((X+X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(shuffle(X) ,7) ) ,12) ) ,7) ) ,7) ) ,4) ) ) ) ,12) ) ,12) ) ,7) ) ,12) ) random seed used was 264032070
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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