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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((step((transpose(shuffle((transpose(X,-5) |X) ) ,4) +transpose((echo(transpose((transpose((X|X) ,-7) |arpeggio((X|X) ) ) ,-5) ,4,6) |echo((step(transpose(X,4) ,12) +transpose(((X|transpose(arpeggio(X) ,4) ) +transpose((transpose(echo(X,4,6) ,4) +transpose((transpose(X,-7) +shuffle(X) ) ,7) ) ,7) ) ,12) ) ,4,6) ) ,7) ) ,12) +transpose(transpose(step(step(arpeggio(transpose((X+X) ,-7) ) ,12) ,12) ,-5) ,12) ) ,-7) +(transpose((((((((step((X+transpose((X+transpose(X,7) ) ,7) ) ,12) +transpose(transpose(shuffle(((shuffle(X) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) ,4) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(transpose((((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X+X) ,7) ) |transpose(transpose(X,-5) ,-7) ) |((((transpose(transpose(X,4) ,4) +transpose(((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose((arpeggio(X) |transpose(X,-5) ) ,7) ) +transpose(transpose((X|step(X,12) ) ,4) ,4) ) +transpose(((X+transpose((X|X) ,7) ) |(((X+X) +transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) ) ,7) ) ) ,-7) ,4) ) +transpose((((X+(X|X) ) |(X+transpose((X+X) ,7) ) ) |(transpose(X,4) |(X+X) ) ) ,7) ) +transpose(arpeggio(transpose((echo((X+X) ,4,6) +transpose(transpose(X,-5) ,7) ) ,-7) ) ,4) ) +transpose((echo(transpose(X,-7) ,4,6) |step(X,12) ) ,-7) ) +transpose(transpose(transpose(((step(transpose(transpose(X,4) ,-7) ,12) +transpose((transpose(((X+transpose((X+X) ,12) ) +transpose(transpose(echo((X+transpose(X,7) ) ,4,6) ,-7) ,12) ) ,-7) |echo(transpose(transpose(echo(X,4,6) ,-7) ,4) ,4,6) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,4) ,-7) ,4) ) ,4) |echo(((transpose(((transpose(echo((X+((X+transpose(X,7) ) |transpose(X,4) ) ) ,4,6) ,-5) +transpose((((step(transpose(shuffle(X) ,4) ,12) +transpose((transpose(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ,4) +transpose(transpose(echo(X,4,6) ,4) ,-7) ) ,12) ) +echo((arpeggio(X) |(X+echo(X,4,6) ) ) ,4,6) ) +(transpose((transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) +transpose(transpose(echo(X,4,6) ,4) ,12) ) ,-5) +transpose(transpose((step(X,12) +(X+X) ) ,4) ,-7) ) ) ,4) ) +transpose((((transpose(((X|X) +transpose((transpose(X,-5) +(X+X) ) ,12) ) ,4) +transpose(transpose(transpose(arpeggio(step(transpose(X,-7) ,12) ) ,4) ,-5) ,4) ) +transpose(step(((shuffle(X) +X) +transpose(transpose(X,-7) ,12) ) ,12) ,7) ) +arpeggio(echo(transpose((X+X) ,-5) ,4,6) ) ) ,7) ) ,-5) +transpose(transpose((echo(transpose((transpose(X,4) +arpeggio(X) ) ,4) ,4,6) +transpose(((transpose((shuffle(X) |((step(X,12) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,-7) +transpose(transpose((X+transpose(transpose(shuffle(X) ,4) ,12) ) ,4) ,4) ) +transpose(((shuffle(step((X+X) ,12) ) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose(echo((arpeggio((X|X) ) +X) ,4,6) ,7) ) ,7) ) ,-5) ) ,-5) ,-7) ) +step(step(transpose(transpose((step(transpose((X+X) ,4) ,12) |(transpose((X+transpose(X,7) ) ,4) |(X+transpose(X,7) ) ) ) ,-5) ,-7) ,12) ,12) ) ,4,6) ) ) |transpose(transpose(((echo((((((step(transpose((X+X) ,4) ,12) |transpose(shuffle(step(X,12) ) ,-5) ) +step(step(arpeggio(X) ,12) ,12) ) +transpose(shuffle(transpose(transpose(transpose(transpose((transpose(X,-7) +transpose((X+X) ,12) ) ,-5) ,4) ,4) ,4) ) ,12) ) +transpose((transpose((((echo(X,4,6) +transpose(((shuffle(X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +((X+transpose((X+X) ,12) ) +transpose((step((X+X) ,12) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) ,-7) +transpose(((((shuffle(step((X+transpose(X,7) ) ,12) ) +transpose((transpose(transpose(X,4) ,4) +echo(X,4,6) ) ,7) ) |step((X+transpose(X,12) ) ,12) ) |((transpose((echo(X,4,6) +X) ,4) +transpose((((transpose(X,4) +transpose(X,7) ) +(arpeggio(X) +X) ) +transpose((arpeggio(X) |(X|X) ) ,12) ) ,4) ) +transpose(((X+transpose((X+transpose(X,7) ) ,12) ) +transpose(((X+X) +transpose(X,4) ) ,4) ) ,7) ) ) +(((X+arpeggio(X) ) |transpose((X|X) ,4) ) +transpose(echo(X,4,6) ,12) ) ) ,7) ) ,12) ) +transpose((transpose(step(arpeggio(arpeggio((X+X) ) ) ,12) ,4) +transpose((step(((transpose((X|X) ,-5) +transpose(transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose((X|X) ,7) ) +transpose(X,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,4) ,4) ) +transpose(arpeggio((X+transpose(transpose(X,-7) ,7) ) ) ,7) ) ,12) +transpose((echo(transpose(((X+X) |echo(step(X,12) ,4,6) ) ,-7) ,4,6) +transpose(((transpose((X+transpose(X,12) ) ,4) +(X|shuffle(X) ) ) +transpose(shuffle(step(transpose(arpeggio(X) ,4) ,12) ) ,7) ) ,12) ) ,7) ) ,7) ) ,7) ) ,4,6) |transpose(transpose((((((X+X) +transpose((step((X+transpose(X,7) ) ,12) +transpose((transpose(X,4) +transpose((X|X) ,12) ) ,12) ) ,4) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,-5) ,7) ) +transpose(transpose(transpose(arpeggio(shuffle(transpose(X,-7) ) ) ,-5) ,-5) ,12) ) +transpose((transpose((transpose(((step(X,12) +transpose((X+transpose(X,7) ) ,7) ) +transpose(transpose((X+X) ,4) ,-5) ) ,-5) +transpose(transpose(shuffle(transpose(X,-7) ) ,4) ,12) ) ,-7) +transpose(((transpose(arpeggio(transpose(X,4) ) ,4) +(transpose((transpose((X|X) ,-5) +shuffle(X) ) ,4) +transpose((transpose(arpeggio(transpose(X,-5) ) ,-5) +transpose((transpose(arpeggio(X) ,-7) +((X|X) +transpose(X,7) ) ) ,12) ) ,12) ) ) +(transpose(transpose(((X+transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) ,4) +transpose(transpose(step((X+X) ,12) ,-7) ,7) ) ) ,7) ) ,7) ) ,4) ,4) ) +(transpose(echo((transpose(X,-7) +transpose((transpose(transpose(X,-5) ,-7) +step(((transpose(X,-5) |(X+X) ) +((X+transpose(transpose(X,4) ,12) ) +arpeggio(((X|X) +transpose(X,4) ) ) ) ) ,12) ) ,12) ) ,4,6) ,-5) +transpose(transpose(shuffle(transpose(transpose((((X|X) |X) |((X+X) |transpose(X,-5) ) ) ,4) ,4) ) ,-5) ,12) ) ) ,-5) ,4) ) random seed used was 198083745
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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