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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 12 generations the expression "X" became this: | ((shuffle(arpeggio(arpeggio((((((transpose(X,-5) +transpose((X+X) ,4) ) +transpose((X+X) ,7) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((transpose((X+transpose(X,12) ) ,-5) +transpose(((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(((X+transpose((X|X) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose(arpeggio((X|X) ) ,7) ) ,7) ) ) ) ) +(step(shuffle(echo(step(arpeggio(arpeggio(X) ) ,12) ,4,6) ) ,12) +transpose(((((((shuffle(X) +transpose(echo((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,4) ) +transpose(echo(shuffle(step((X+X) ,12) ) ,4,6) ,7) ) |transpose(arpeggio(X) ,-5) ) +transpose(shuffle(((arpeggio(X) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose((X+X) ,7) ) ) ,7) ) +transpose(((((shuffle(X) +transpose(X,4) ) +transpose(step(X,12) ,7) ) +transpose(echo((X+X) ,4,6) ,4) ) +transpose((arpeggio(X) +(X+transpose(X,7) ) ) ,7) ) ,4) ) +transpose(((((transpose(transpose(shuffle(X) ,-5) ,-5) +transpose(transpose(echo((((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,4) ,4) ) +transpose(transpose(echo(transpose(transpose(X,4) ,-5) ,4,6) ,-5) ,7) ) +transpose((((transpose((((X|X) +transpose((arpeggio(X) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,-5) +transpose((step(X,12) +transpose((transpose(transpose(X,-7) ,-5) +transpose(arpeggio(X) ,12) ) ,7) ) ,4) ) +transpose(shuffle(((echo(X,4,6) +transpose((X|X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,7) ) |transpose(echo((X+((X+X) +transpose(transpose(X,4) ,12) ) ) ,4,6) ,4) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,7) ) ,7) ) ,12) ) ) +transpose(((echo((arpeggio(echo(transpose((X+transpose(X,7) ) ,-7) ,4,6) ) +shuffle(X) ) ,4,6) +transpose(transpose(((transpose(((transpose(transpose(transpose(X,-5) ,-7) ,-5) +transpose(step(echo(X,4,6) ,12) ,4) ) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ,-7) +transpose(shuffle(transpose(shuffle(X) ,4) ) ,4) ) +transpose(((transpose(shuffle(X) ,-5) +echo(arpeggio(X) ,4,6) ) |(arpeggio(((X+X) +(X+transpose(X,7) ) ) ) +transpose((((X+transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(arpeggio((X+X) ) ,-5) ,7) ) ,7) ) ) ,7) ) ,4) ,7) ) +((((transpose(shuffle(X) ,-7) +transpose((step(X,12) +transpose(echo(X,4,6) ,12) ) ,-7) ) +transpose(transpose(transpose(step(arpeggio(X) ,12) ,-7) ,-7) ,7) ) +shuffle(echo(((arpeggio(X) +transpose(transpose(X,4) ,12) ) +(((X+X) |(X|X) ) +transpose(arpeggio(X) ,7) ) ) ,4,6) ) ) |(echo(echo(step(X,12) ,4,6) ,4,6) +transpose(((((((X+transpose((X+X) ,7) ) +transpose(((X+transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) |arpeggio((X+arpeggio(X) ) ) ) +transpose(transpose(step(echo(X,4,6) ,12) ,-7) ,4) ) +transpose(echo((shuffle(X) +transpose((X+transpose(X,7) ) ,-5) ) ,4,6) ,7) ) ,12) ) ) ) ,12) ) random seed used was 15690594
EXPR = (((transpose(step(shuffle((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(arpeggio(step(X,12) ) ,12) ) ) ,12) ,-5) +echo((X+transpose(((((X+transpose(X,12) ) +arpeggio(X) ) +transpose(transpose(X,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,4,6) ) +transpose(((((((transpose(step(X,12) ,-7) +transpose((X+transpose(arpeggio(X) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(shuffle(X) ,-7) ,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) +((transpose(echo(transpose(X,-5) ,4,6) ,4) +transpose(transpose(transpose(X,-7) ,-5) ,4) ) +transpose(step(transpose(X,4) ,12) ,7) ) ) +transpose(echo(((step(X,12) |step((X+transpose(X,7) ) ,12) ) +transpose((((X+X) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,7) ) ,4,6) ,7) ) ,4) ) +transpose((((arpeggio(echo(transpose((((arpeggio(X) +(X+transpose(transpose(X,4) ,12) ) ) +transpose(shuffle(arpeggio(((X+transpose(X,7) ) |X) ) ) ,4) ) +transpose(arpeggio(shuffle(X) ) ,7) ) ,4) ,4,6) ) +transpose(arpeggio(transpose(((shuffle((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(arpeggio((X+transpose((X+X) ,7) ) ) ,4) ) +transpose((((((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((transpose(X,-5) |step(X,12) ) ,7) ) +transpose(transpose(step(X,12) ,-7) ,4) ) +transpose((echo(X,4,6) +step(X,12) ) ,7) ) +transpose(transpose(shuffle((X+transpose(X,12) ) ) ,-7) ,7) ) ,7) ) ,-5) ) ,4) ) +transpose(transpose((arpeggio(((X+transpose(X,7) ) +transpose(shuffle(step((X+transpose(X,7) ) ,12) ) ,7) ) ) +transpose(transpose(((echo((X+transpose(X,7) ) ,4,6) +transpose(step(echo(X,4,6) ,12) ,7) ) +transpose(transpose(arpeggio((X+X) ) ,4) ,7) ) ,4) ,7) ) ,4) ,7) ) +shuffle(echo((step(transpose(((X|echo(X,4,6) ) |(echo(X,4,6) |transpose(X,4) ) ) ,4) ,12) |arpeggio(transpose(transpose(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-7) ,4) ) ) ,4,6) ) ) ,7) ) random seed used was 0
EXPR = arpeggio(((transpose(shuffle(shuffle(((step(((X+X) +transpose(transpose(X,-7) ,12) ) ,12) |(transpose(X,-7) +step(X,12) ) ) |shuffle(echo(arpeggio(X) ,4,6) ) ) ) ) ,-5) +transpose((transpose(echo(echo(echo(shuffle(arpeggio(X) ) ,4,6) ,4,6) ,4,6) ,-5) +transpose(arpeggio(arpeggio((arpeggio(echo((X+transpose(X,7) ) ,4,6) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ) ) ,7) ) ,4) ) +transpose((((step(transpose((step(transpose(X,-7) ,12) +(arpeggio(X) +transpose(((X+transpose(X,12) ) +transpose(X,12) ) ,12) ) ) ,-7) ,12) +transpose(shuffle((transpose((X+transpose(X,12) ) ,-5) +transpose(X,12) ) ) ,7) ) +echo(arpeggio(arpeggio((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ) ,4,6) ) +(((echo(step(X,12) ,4,6) +transpose((((X|X) |echo(X,4,6) ) +transpose(arpeggio(((X+transpose(X,7) ) +transpose(X,7) ) ) ,12) ) ,7) ) +transpose(transpose(((shuffle(((transpose(X,-7) +transpose(step(X,12) ,4) ) +transpose((X+X) ,7) ) ) +transpose(arpeggio((arpeggio(X) |echo(X,4,6) ) ) ,7) ) |transpose(step(transpose(X,4) ,12) ,-7) ) ,-5) ,4) ) +transpose(transpose(X,-5) ,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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