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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 17 generations the expression "X" became this: | (transpose((((step(((transpose(transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,-5) ,-7) +transpose(transpose(arpeggio((transpose(X,-7) +X) ) ,4) ,4) ) +transpose(((arpeggio(arpeggio(transpose(transpose(transpose(transpose(X,-5) ,4) ,-7) ,-5) ) ) +transpose((transpose(transpose((X|(X+X) ) ,-7) ,4) +(((step(transpose(X,-5) ,12) |(X|transpose(X,-5) ) ) +transpose(((transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,4) ,-5) +transpose((((transpose((X+X) ,-7) +transpose(transpose(transpose(X,4) ,4) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,7) ) +((transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(((X+transpose(X,12) ) +(X|X) ) ,7) ) +transpose(transpose(((X+transpose((X|X) ,7) ) +transpose((X+transpose(X,12) ) ,12) ) ,4) ,7) ) ) ,4) ) +transpose((((transpose(((X+transpose(echo(X,4,6) ,12) ) |(X|X) ) ,-5) +transpose(transpose(transpose(((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,-5) ,4) ) +transpose(((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) +transpose(((transpose(X,-5) +transpose(X,12) ) +transpose(X,-5) ) ,7) ) ,7) ) +transpose((((X+X) +transpose(X,7) ) +transpose((shuffle(echo((transpose(X,4) |(X+transpose(X,12) ) ) ,4,6) ) +transpose(step((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,-7) ) ,7) ) ,12) ) ,7) ) ) ,4) ) +transpose(((transpose((step((transpose(((X+X) |X) ,-5) +transpose(transpose(transpose((X+transpose(X,7) ) ,-5) ,-7) ,12) ) ,12) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,4) ,7) ) ,-5) +transpose((transpose(step(step(X,12) ,12) ,-7) |echo(transpose(transpose((X+X) ,-5) ,-7) ,4,6) ) ,4) ) +transpose(arpeggio(((((X+X) +transpose(X,-7) ) +transpose((step((X+X) ,12) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose(echo(transpose(transpose(X,-7) ,4) ,4,6) ,12) ) ) ,7) ) ,7) ) ,7) ) ,12) +transpose(((transpose((shuffle((((arpeggio(X) +transpose(transpose(X,4) ,4) ) +transpose((X|X) ,7) ) |transpose(transpose(X,-7) ,4) ) ) +transpose((((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) |shuffle(X) ) ,12) ) ,4) +transpose((((transpose(transpose(X,4) ,4) |arpeggio(transpose((X+X) ,-5) ) ) +transpose((transpose((X|(X+X) ) ,4) +transpose(step(transpose(transpose(X,-5) ,-5) ,12) ,7) ) ,7) ) +transpose((echo(X,4,6) +transpose(X,7) ) ,-7) ) ,4) ) +transpose(((X+X) |shuffle(X) ) ,7) ) ,4) ) +transpose(transpose((step(transpose((transpose(shuffle(X) ,4) +transpose((transpose(X,-7) +transpose(X,12) ) ,12) ) ,-7) ,12) +transpose(arpeggio(arpeggio((transpose(X,-5) +transpose(X,12) ) ) ) ,7) ) ,-7) ,7) ) +(transpose(((arpeggio(((transpose(((X+transpose((echo(X,4,6) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) |transpose((X+X) ,-5) ) +transpose(transpose(transpose(echo(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4,6) ,4) ,-5) ,7) ) ) +transpose(((((echo((transpose((X+transpose(X,7) ) ,4) +transpose(transpose(X,-5) ,-7) ) ,4,6) |(((X+X) +(X+transpose(X,12) ) ) +transpose(shuffle((X|X) ) ,7) ) ) +transpose(shuffle(step(transpose((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(((X+X) +shuffle(X) ) ,7) ) ,-7) ,12) ) ,12) ) +transpose((transpose(transpose(transpose(transpose(X,-5) ,-5) ,4) ,4) +(echo((((X+X) +transpose(X,4) ) +transpose(X,7) ) ,4,6) |((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose((arpeggio(X) +transpose(X,12) ) ,12) ) ) ) ,4) ) +transpose((echo((echo(((X+X) +transpose(X,12) ) ,4,6) |((arpeggio(shuffle(X) ) +transpose(X,4) ) +transpose((X+transpose(arpeggio(X) ,12) ) ,7) ) ) ,4,6) |(transpose((X|transpose(X,-7) ) ,4) +(((echo((X|X) ,4,6) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) |((transpose((X+X) ,4) +transpose((X+X) ,4) ) +transpose((((X|X) +transpose(arpeggio(X) ,4) ) +transpose((X|X) ,7) ) ,7) ) ) ) ) ,7) ) ,7) ) +transpose(transpose(shuffle(((transpose(X,-5) +transpose(X,4) ) +transpose(shuffle(X) ,12) ) ) ,4) ,7) ) ,-5) +transpose((((transpose(echo(transpose((transpose(transpose(X,-7) ,4) +(transpose((X|X) ,-7) +(step(X,12) |transpose(X,-7) ) ) ) ,-5) ,4,6) ,-7) |(shuffle(((X+transpose(transpose(X,-5) ,-5) ) |(arpeggio(arpeggio(X) ) +((X+X) |echo((X+X) ,4,6) ) ) ) ) |((step(step(X,12) ,12) +transpose((((X|(X+X) ) +transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) ,7) ) +(((transpose(X,-7) |(X+transpose(X,12) ) ) |(X|transpose(X,4) ) ) +transpose(shuffle((transpose(X,4) |X) ) ,12) ) ) ) ) |(transpose((X|step(X,12) ) ,4) +transpose((arpeggio(X) +transpose(X,-5) ) ,7) ) ) |transpose((transpose((step(transpose(X,-7) ,12) +transpose(((step(echo(transpose(X,4) ,4,6) ,12) +transpose(arpeggio(echo(X,4,6) ) ,-5) ) +transpose(((X+X) |transpose(X,4) ) ,12) ) ,7) ) ,4) |transpose(((transpose((X+X) ,-5) |(transpose(X,-5) +shuffle(X) ) ) |shuffle(transpose(X,-5) ) ) ,4) ) ,4) ) ,7) ) ) ,-5) |echo(step(shuffle(echo((transpose(((transpose(((transpose(X,-5) +transpose(shuffle((X+X) ) ,7) ) +transpose((X+transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,-7) ) ,-5) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,4) ) +transpose(arpeggio((transpose(X,4) |(((X+transpose(X,4) ) +transpose(X,7) ) +arpeggio(X) ) ) ) ,7) ) ,4) +arpeggio((transpose(echo((X|transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,4,6) ,4) +transpose((transpose(transpose((X|transpose(X,-5) ) ,4) ,-7) +((X|step((step(X,12) |X) ,12) ) +transpose(echo((((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |transpose(transpose(X,4) ,-7) ) ,4,6) ,7) ) ) ,12) ) ) ) ,4,6) ) ,12) ,4,6) ) random seed used was 3621111
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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