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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 13 generations the expression "X" became this: | (echo(((step(echo(arpeggio((transpose(echo(X,4,6) ,-7) +shuffle((X+transpose(X,12) ) ) ) ) ,4,6) ,12) +transpose(transpose((arpeggio(echo(transpose(X,-7) ,4,6) ) +transpose((transpose(arpeggio(X) ,4) +arpeggio(X) ) ,12) ) ,4) ,7) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,4,6) +transpose(((echo((shuffle(((X+transpose(echo((X+X) ,4,6) ,7) ) +(transpose(X,-7) +transpose(transpose(X,-5) ,7) ) ) ) +transpose((((((step(X,12) |(X|X) ) +transpose(echo(X,4,6) ,-5) ) |transpose(transpose(X,-7) ,4) ) +((transpose(arpeggio(X) ,-7) +transpose((transpose(X,4) +transpose(echo(X,4,6) ,12) ) ,7) ) +echo(transpose((X+X) ,-7) ,4,6) ) ) +transpose(transpose((shuffle(echo((transpose(X,4) +transpose(step(X,12) ,-7) ) ,4,6) ) |((((X+transpose(X,7) ) +step(X,12) ) +X) +(transpose(X,4) |transpose(X,4) ) ) ) ,-7) ,7) ) ,7) ) ,4,6) +transpose(transpose((step((shuffle(echo(X,4,6) ) +transpose(((((transpose(X,-5) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) +transpose(shuffle(transpose((X+X) ,-5) ) ,4) ) +transpose((transpose(X,4) |X) ,7) ) ,12) ) ,12) +transpose(shuffle(((transpose(X,-7) +(arpeggio(X) +X) ) +transpose(transpose(X,4) ,12) ) ) ,12) ) ,-7) ,4) ) +transpose((transpose(transpose(transpose(step((X+X) ,12) ,-5) ,-5) ,4) +(((((arpeggio(transpose(X,4) ) +transpose(step(echo(X,4,6) ,12) ,7) ) +transpose(echo((step(X,12) +(X+transpose(X,12) ) ) ,4,6) ,7) ) +transpose(transpose(echo(shuffle(transpose(echo((X+transpose(X,7) ) ,4,6) ,4) ) ,4,6) ,-7) ,4) ) +transpose(transpose(transpose((((X+transpose(X,12) ) +transpose((X|X) ,7) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) ,-7) ,-5) ,7) ) +(((arpeggio(X) |echo(X,4,6) ) +transpose(shuffle((X+transpose((X+transpose(X,12) ) ,12) ) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ) ) ) ,7) ) ,7) ) random seed used was 210137946
EXPR = transpose((arpeggio((arpeggio(((transpose(transpose(X,4) ,4) +transpose(transpose(transpose(arpeggio(echo(X,4,6) ) ,-5) ,4) ,4) ) +transpose(echo(shuffle(transpose(X,-5) ) ,4,6) ,7) ) ) +shuffle(echo(transpose(((X|(X+transpose(X,7) ) ) |(X+(X|X) ) ) ,-5) ,4,6) ) ) ) |((echo(transpose(arpeggio(((arpeggio(X) +transpose((X+X) ,4) ) +transpose((X|X) ,7) ) ) ,-5) ,4,6) +transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(echo(X,4,6) ,7) ) +shuffle((X|X) ) ) ,4) ) +transpose((transpose((X+transpose(transpose((X+X) ,-7) ,7) ) ,-5) |(transpose(echo(X,4,6) ,-5) |transpose((echo((X+transpose(X,7) ) ,4,6) +(transpose(X,-7) |(transpose(transpose(X,-7) ,-7) +transpose((X|X) ,7) ) ) ) ,-5) ) ) ,12) ) ) ,-7) random seed used was 0
EXPR = arpeggio((((arpeggio(transpose(((step(shuffle(transpose(X,4) ) ,12) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(transpose(X,-7) ) ,7) ) ,-5) ) +transpose((((arpeggio(shuffle(shuffle((X+transpose((X+X) ,7) ) ) ) ) |transpose((X+transpose(step(X,12) ,-5) ) ,4) ) +(((X+transpose((transpose(((X+X) +transpose(X,7) ) ,-7) +transpose(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,7) ) ,7) ) +transpose((transpose((transpose(X,4) +transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,7) ) ,-7) |((shuffle(transpose(step(X,12) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) |transpose(X,-7) ) ) ,12) ) +transpose((transpose(X,4) |transpose(X,-5) ) ,7) ) ) |step((transpose(transpose(echo(transpose(transpose((X+X) ,-7) ,4) ,4,6) ,-5) ,-7) +transpose(((((X+X) +transpose((((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) +transpose((X|X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) |transpose(((X+transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ) |(transpose((transpose(X,-5) +(transpose(X,4) |transpose(X,-7) ) ) ,-7) +((step(X,12) +(transpose(X,4) +transpose((shuffle(X) +transpose(X,12) ) ,12) ) ) |(transpose(X,-7) |transpose(X,-5) ) ) ) ) ,7) ) ,12) ) ,12) ) +transpose(echo((transpose((step((echo(X,4,6) |((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) +arpeggio((X+X) ) ) ) ,12) +transpose((transpose(shuffle(X) ,-5) |transpose((transpose(X,-7) |X) ,-5) ) ,12) ) ,-7) |(arpeggio(transpose(step((transpose(X,-5) +X) ,12) ,-7) ) +transpose((arpeggio(transpose(transpose(transpose(X,-5) ,-5) ,-7) ) +transpose(((((transpose(X,4) |X) +((X+transpose(X,4) ) +transpose(X,7) ) ) |echo(((X+X) +echo(X,4,6) ) ,4,6) ) |((transpose((X|X) ,-5) +transpose(transpose(X,-5) ,7) ) +transpose((((transpose(X,-5) |(X|X) ) +transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,7) ) ) ,12) ) ,4) ) ) ,4,6) ,4) ) +transpose(((transpose((transpose(transpose((X+transpose(echo(X,4,6) ,7) ) ,4) ,4) |transpose(echo(transpose(X,4) ,4,6) ,-7) ) ,4) +transpose(((transpose(arpeggio((X+transpose(X,7) ) ) ,-5) +shuffle(transpose(transpose((X|X) ,-7) ,4) ) ) +(transpose(echo((((transpose(X,-5) +transpose(transpose(X,-5) ,7) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4,6) ,-5) +transpose(step(transpose((echo(transpose(X,-5) ,4,6) +(X+transpose(X,-5) ) ) ,-5) ,12) ,12) ) ) ,7) ) +transpose((((step((arpeggio(step(X,12) ) +(transpose(X,4) +transpose(X,-5) ) ) ,12) |shuffle((transpose(echo(X,4,6) ,-5) +transpose(transpose(transpose(transpose(X,4) ,-7) ,-5) ,12) ) ) ) |((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose((X|X) ,4) ) +transpose(transpose((X+transpose(shuffle(X) ,12) ) ,-7) ,7) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) +arpeggio(transpose((transpose((X+X) ,-5) |arpeggio(transpose(X,-7) ) ) ,-7) ) ) ) +transpose((echo(((transpose(transpose(transpose(X,-7) ,-7) ,4) |transpose((transpose(X,4) +transpose((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(transpose(transpose(transpose(X,4) ,-5) ,4) ,12) ) ,4,6) +shuffle((shuffle((arpeggio(transpose(transpose(X,-7) ,4) ) +transpose(((X|X) |X) ,12) ) ) +transpose((transpose(X,-7) +echo(X,4,6) ) ,4) ) ) ) ,12) ) ,12) ) ,7) ) ) random seed used was 0
EXPR = (((arpeggio(transpose((step(step(X,12) ,12) |(shuffle(transpose(shuffle(shuffle(X) ) ,4) ) |transpose(transpose(transpose(X,4) ,-7) ,-7) ) ) ,-5) ) +transpose(transpose(((step(transpose(X,4) ,12) |(transpose((X|(X|X) ) ,-5) +(X|shuffle(X) ) ) ) +transpose(echo(arpeggio(X) ,4,6) ,12) ) ,-7) ,4) ) +transpose(transpose(shuffle((transpose((((X+transpose(X,12) ) +transpose(step(shuffle(X) ,12) ,4) ) +transpose((transpose(X,-7) |(X+transpose(X,7) ) ) ,7) ) ,4) +transpose(((step(transpose(X,4) ,12) |X) +transpose((transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,-5) |(X+transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ,12) ) ) ,7) ) ,-7) ) ) ,4) ,7) ) +transpose((((step(((X|X) +((X+transpose((X+transpose(X,12) ) ,7) ) |transpose((X+transpose(X,12) ) ,4) ) ) ,12) +transpose((echo((((transpose(((X+X) +X) ,-5) +transpose(((X+(X+transpose(X,12) ) ) +arpeggio(X) ) ,7) ) +transpose(echo(transpose((transpose(X,4) +transpose(X,-5) ) ,-5) ,4,6) ,12) ) |(transpose(X,-7) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) |X) ,4) ) ) ,4,6) |echo((shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) |transpose(arpeggio(((X+transpose(X,12) ) +(X|X) ) ) ,-7) ) ,4,6) ) ,4) ) +transpose(transpose(transpose((transpose((X+transpose((X|X) ,12) ) ,-7) +transpose(transpose(X,-7) ,12) ) ,4) ,-5) ,7) ) +((transpose(transpose(step((X|(X+transpose((X+transpose(X,12) ) ,12) ) ) ,12) ,-7) ,4) +transpose(transpose((transpose(((shuffle(X) +transpose(transpose(X,-7) ,4) ) +transpose((step(X,12) |X) ,7) ) ,4) +transpose(transpose(echo((transpose(X,4) +transpose((X|X) ,-5) ) ,4,6) ,-5) ,7) ) ,-5) ,4) ) +transpose(step(shuffle(((transpose(transpose(X,-5) ,4) +(((X+transpose(X,12) ) +transpose(transpose(X,-5) ,4) ) +transpose(echo(X,4,6) ,7) ) ) |(transpose(transpose(X,-5) ,4) +transpose(X,7) ) ) ) ,12) ,7) ) ) ,7) ) random seed used was 0
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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