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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 14 generations the expression "X" became this: | ((transpose((arpeggio((((shuffle(shuffle((((X+X) +transpose(echo(X,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ) +transpose(((arpeggio((transpose(transpose(X,4) ,4) |(shuffle(step(transpose(X,4) ,12) ) +arpeggio(transpose(X,4) ) ) ) ) +transpose(echo(step(echo((step(X,12) +transpose(transpose(X,-7) ,12) ) ,4,6) ,12) ,4,6) ,12) ) +transpose((transpose(shuffle(transpose(X,4) ) ,-5) +transpose(((transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-7) +transpose(step(X,12) ,4) ) +transpose(shuffle(transpose(X,4) ) ,7) ) ,7) ) ,12) ) ,7) ) +transpose(step(transpose(step(shuffle(X) ,12) ,4) ,12) ,4) ) +transpose((echo(transpose(((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +(arpeggio(X) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) |step(X,12) ) ,-7) ,4,6) +echo((((X+transpose(X,7) ) |echo(X,4,6) ) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ) ,4,6) ) ,7) ) ) +((arpeggio(((((transpose((X+transpose(X,12) ) ,-5) |((X+X) +transpose(X,7) ) ) +transpose(X,12) ) +transpose((step(echo(X,4,6) ,12) +step(((X+transpose((X+transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,12) ) ,12) ) +transpose(arpeggio(echo(shuffle(X) ,4,6) ) ,7) ) ) +transpose(transpose(echo(shuffle((((X|shuffle(X) ) +arpeggio(echo(X,4,6) ) ) |transpose((X|X) ,4) ) ) ,4,6) ,-5) ,12) ) +transpose((step(step(shuffle(shuffle(echo(transpose((echo(X,4,6) |(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,-7) ,4,6) ) ) ,12) ,12) +transpose((((((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(shuffle(echo(X,4,6) ) ,7) ) +transpose(arpeggio(arpeggio(transpose(X,-5) ) ) ,7) ) +transpose((step(arpeggio((X+transpose(X,7) ) ) ,12) +shuffle((((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ) ,4) ) +transpose(((transpose(X,4) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) |step((transpose((X+X) ,-7) +(step(X,12) |arpeggio(X) ) ) ,12) ) ,7) ) ,7) ) ,7) ) ) ,-7) +transpose(arpeggio(((echo((echo(transpose(shuffle(echo(echo(X,4,6) ,4,6) ) ,-7) ,4,6) +shuffle(transpose((((echo(((X+transpose(X,12) ) +transpose((X+X) ,12) ) ,4,6) +transpose((echo(echo(X,4,6) ,4,6) +transpose((((X+transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose(shuffle((echo(arpeggio(X) ,4,6) +transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ) ,7) ) +(arpeggio(arpeggio(transpose(X,4) ) ) +arpeggio(X) ) ) ,-5) ) ) ,4,6) +transpose((transpose(echo(transpose((arpeggio(X) +transpose(X,7) ) ,-5) ,4,6) ,-7) +transpose(((transpose(step(echo(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,4,6) ,12) ,-5) +transpose(echo(transpose(((step(X,12) +transpose(X,4) ) +transpose((X|X) ,7) ) ,-7) ,4,6) ,4) ) +transpose((transpose(shuffle(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(step(X,12) ,-5) ,7) ) ) ,-7) +transpose((transpose(transpose((X+X) ,-7) ,-5) +transpose(echo((X|X) ,4,6) ,12) ) ,4) ) ,7) ) ,7) ) ,4) ) +transpose((transpose(((arpeggio((X|(X+transpose((X|X) ,7) ) ) ) |transpose(transpose((X+X) ,-7) ,4) ) |shuffle(shuffle((((X|X) +((X+transpose(X,7) ) +transpose(step(X,12) ,12) ) ) +echo(X,4,6) ) ) ) ) ,-7) +(transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) +shuffle(transpose(X,-7) ) ) ) ,7) ) ) ,4) ) +transpose((shuffle((step(transpose(((X+X) +shuffle(shuffle(X) ) ) ,-5) ,12) +transpose(transpose((step(X,12) +(arpeggio(transpose(X,-7) ) +transpose((((X+X) +transpose(X,7) ) +step(X,12) ) ,12) ) ) ,-7) ,12) ) ) +(((transpose(echo(transpose(arpeggio(transpose(X,4) ) ,-7) ,4,6) ,-7) +transpose(((((step(X,12) +((X+transpose(X,12) ) +step(X,12) ) ) +echo((X+transpose(X,12) ) ,4,6) ) +transpose(transpose(((((echo(arpeggio(X) ,4,6) +transpose(step((X+transpose(X,7) ) ,12) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) +transpose(((transpose((X+transpose(X,12) ) ,4) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) ,12) ) +transpose(((shuffle((((X+transpose(X,7) ) +transpose((X|X) ,4) ) +transpose(X,7) ) ) +transpose((X|X) ,12) ) |(((X|(X+transpose(X,7) ) ) +transpose(X,12) ) +transpose(((X+transpose(((X+transpose(X,7) ) +X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) ) ,12) ) ,4) ,4) ) +transpose(transpose((transpose(arpeggio(shuffle((X+transpose(X,12) ) ) ) ,4) +transpose(((step(X,12) +transpose(X,4) ) |step(echo(X,4,6) ,12) ) ,12) ) ,4) ,7) ) ,7) ) +transpose((((((step(X,12) +transpose((shuffle(X) +transpose(arpeggio(X) ,7) ) ,7) ) +transpose(((step((X+transpose(shuffle(shuffle(X) ) ,7) ) ,12) +transpose(X,4) ) +transpose((echo(transpose(step(shuffle(X) ,12) ,4) ,4,6) +transpose((((X+transpose(X,4) ) +transpose(shuffle(X) ,7) ) |(echo(X,4,6) +transpose(arpeggio(X) ,12) ) ) ,7) ) ,7) ) ,4) ) +transpose((step(echo((transpose(X,-5) +transpose(shuffle(X) ,12) ) ,4,6) ,12) |echo(shuffle(transpose(X,-5) ) ,4,6) ) ,7) ) +echo((((((X+X) +transpose(X,7) ) +transpose(echo(X,4,6) ,12) ) +transpose((transpose((X|X) ,-5) +transpose(((arpeggio(X) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ) ,12) ) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ,4,6) ) +transpose(echo((((transpose(X,-5) +transpose(echo(echo(echo(X,4,6) ,4,6) ,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) +(arpeggio((echo((X+transpose(X,12) ) ,4,6) +transpose(step(X,12) ,12) ) ) +((((X+transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(arpeggio(X) ,7) ) ) ) ,4,6) ,12) ) ,4) ) +transpose((echo(shuffle((transpose(((transpose((X+transpose(X,7) ) ,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(echo(X,4,6) ,4,6) ,7) ) ,-5) +step(echo((X+transpose((arpeggio(X) |(X+transpose(X,12) ) ) ,7) ) ,4,6) ,12) ) ) ,4,6) +transpose(arpeggio(transpose((((((X+transpose(X,4) ) +transpose(X,7) ) |X) +transpose(arpeggio((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,7) ) +(X+transpose((X|X) ,12) ) ) ) ,4) ) +transpose(((X+transpose(step(X,12) ,4) ) +transpose(shuffle(X) ,7) ) ,7) ) ,4) ) ,7) ) ,7) ) ) ,7) ) random seed used was 238954831
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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