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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 16 generations the expression "X" became this: | ((transpose(transpose((step(transpose((shuffle(transpose(X,4) ) +transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) ) ,-5) ,12) |transpose((echo((transpose((X+transpose(X,12) ) ,-7) +(X+transpose(X,12) ) ) ,4,6) +transpose(transpose(((X|X) +transpose((transpose(arpeggio(X) ,-5) +transpose((X+(X+transpose(X,12) ) ) ,7) ) ,7) ) ,-7) ,12) ) ,-7) ) ,-7) ,-7) +((((arpeggio((((((echo(transpose(X,-5) ,4,6) |transpose(X,-5) ) +((X|X) +echo(X,4,6) ) ) |transpose(echo((transpose(X,-5) |X) ,4,6) ,-7) ) +((arpeggio(((X+X) |(X|X) ) ) +transpose(transpose(X,4) ,7) ) |transpose(((X+transpose(transpose(X,-5) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) ) +transpose((arpeggio(X) +(X+X) ) ,4) ) ) |transpose(transpose((((transpose((transpose(X,-7) |((shuffle(X) +transpose(transpose(X,4) ,12) ) +transpose(X,7) ) ) ,4) +transpose(echo(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,4,6) ,7) ) +transpose((((((X|X) +transpose((transpose(X,-7) +transpose(((X|X) |transpose(X,4) ) ,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) +(((transpose(X,-5) +transpose(transpose(X,-7) ,7) ) +transpose(step((X+transpose(X,12) ) ,12) ,12) ) +(transpose((X|X) ,-7) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) ,7) ) ) ) |transpose(step((((X+transpose(transpose(X,4) ,7) ) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ,12) ,4) ) ,4) ) +transpose(transpose(transpose(step((X+transpose(X,12) ) ,12) ,-5) ,-5) ,7) ) ,-5) ,4) ) |echo((arpeggio((((arpeggio(transpose(arpeggio(X) ,-5) ) +transpose((arpeggio((X+X) ) |transpose(X,4) ) ,4) ) +transpose(((((X+X) +transpose((X+transpose(transpose(X,-7) ,7) ) ,7) ) +(arpeggio(X) |(X+transpose(X,7) ) ) ) |shuffle(transpose(X,4) ) ) ,4) ) |arpeggio((((((arpeggio(X) +transpose((X+transpose(X,7) ) ,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(transpose(X,4) ,7) ) +arpeggio(arpeggio((X|X) ) ) ) +(transpose((echo(X,4,6) +transpose(transpose(X,4) ,7) ) ,-5) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |(X+transpose(X,7) ) ) +((X|X) |X) ) ,-7) ) ) ) ) ) +transpose(transpose((step(transpose(echo(X,4,6) ,4) ,12) |(transpose(transpose(arpeggio(X) ,4) ,4) +transpose((((X|X) +(X|X) ) +transpose((transpose(X,-7) +transpose((transpose(X,-5) |((X+transpose((X+X) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,7) ) ,12) ) ,7) ) ) ,-7) ,12) ) ,4,6) ) +transpose(echo(shuffle(((((((((echo(((X|X) +step(X,12) ) ,4,6) +transpose(((transpose(X,4) +transpose(X,7) ) +transpose(X,-7) ) ,12) ) +(arpeggio(echo((X|X) ,4,6) ) |shuffle(((X+transpose(X,12) ) +X) ) ) ) +transpose(((echo(echo(transpose(X,-7) ,4,6) ,4,6) +transpose(((transpose(X,-7) +transpose(X,4) ) +transpose(transpose((X+X) ,4) ,7) ) ,7) ) +transpose(arpeggio(transpose(X,-7) ) ,12) ) ,4) ) +transpose(((transpose(step(echo((X+X) ,4,6) ,12) ,4) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(shuffle(arpeggio((X+transpose(X,7) ) ) ) ,7) ) ,7) ) +transpose(step((transpose((X+transpose(X,12) ) ,4) |step(step(transpose(X,4) ,12) ,12) ) ,12) ,4) ) +transpose((echo(X,4,6) +transpose((shuffle(step(X,12) ) +(X+X) ) ,12) ) ,7) ) +transpose(((((echo(X,4,6) +(X|X) ) +transpose((transpose(X,-5) +transpose(X,12) ) ,-5) ) +transpose(shuffle(transpose(X,4) ) ,7) ) |transpose((step(transpose((X+transpose(X,7) ) ,-7) ,12) +transpose(transpose(transpose(transpose(((X|X) +echo(X,4,6) ) ,4) ,4) ,-5) ,7) ) ,-5) ) ,12) ) +step(shuffle(transpose(((((transpose(X,-7) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(step(transpose(X,4) ,12) ,-5) ,4) ) +transpose(transpose((X+X) ,-7) ,7) ) |(X+transpose(X,7) ) ) ,4) ) ,12) ) ) ,4,6) ,4) ) +transpose((((arpeggio(transpose(((shuffle(echo((X|X) ,4,6) ) +((transpose(transpose(X,4) ,4) +(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,4) ,7) ) ) +transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,7) ) ) |((shuffle((X+transpose(X,7) ) ) |X) +((X|X) +transpose(shuffle(X) ,7) ) ) ) ,-5) ) +transpose(transpose(shuffle(step(((transpose(transpose(((transpose(X,-7) +transpose((X+X) ,4) ) +transpose((X|X) ,7) ) ,-7) ,4) +transpose(step(((X+transpose(step((X+transpose(X,12) ) ,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ,4) ) +transpose((arpeggio((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +(transpose(echo(X,4,6) ,-5) |(((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ) ) ,7) ) ,12) ) ,4) ,12) ) +transpose((((arpeggio((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose((X+transpose(X,12) ) ,7) ) ) |transpose(step(X,12) ,-7) ) +transpose(transpose(((((X|X) +(X+transpose(X,12) ) ) +((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,-5) ,7) ) ) +transpose(transpose(step(X,12) ,-5) ,12) ) ,-7) ,7) ) +transpose(transpose(shuffle((((step(X,12) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(transpose(arpeggio(X) ,-7) ,7) ) +((transpose(X,4) |transpose(transpose(X,-5) ,-5) ) +arpeggio(((X+transpose(X,7) ) |transpose(X,4) ) ) ) ) ) ,-5) ,7) ) ,-5) ) |transpose(transpose(transpose(transpose((transpose(((X|X) +(X+X) ) ,-5) +(((step((X+X) ,12) +transpose((arpeggio(X) +transpose(X,12) ) ,4) ) +transpose(X,7) ) |(X|X) ) ) ,-7) ,4) ,4) ,-7) ) ,7) ) ) |(transpose((transpose((shuffle(transpose(((step(X,12) +transpose((arpeggio(X) +transpose(X,7) ) ,12) ) +(X+X) ) ,-7) ) |((X+transpose(echo(transpose(X,4) ,4,6) ,12) ) |(step(shuffle(X) ,12) +transpose(shuffle(X) ,-7) ) ) ) ,4) +transpose(shuffle(((step(arpeggio((transpose(X,-7) +transpose((arpeggio(((X+transpose(X,7) ) |transpose(X,-7) ) ) +transpose((X+transpose((X+X) ,12) ) ,-7) ) ,7) ) ) ,12) +transpose(arpeggio(arpeggio(transpose((arpeggio(transpose((X+step(X,12) ) ,-7) ) |((transpose((X|X) ,-7) +transpose((X|X) ,4) ) +transpose(X,7) ) ) ,4) ) ) ,12) ) +transpose((transpose(transpose(step(transpose(shuffle(step(echo(X,4,6) ,12) ) ,4) ,12) ,-5) ,-5) +arpeggio(transpose(((step(((X+transpose((echo(X,4,6) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ,12) +transpose(transpose((step(X,12) +transpose(X,-7) ) ,-5) ,4) ) +transpose(((X+(transpose(X,-5) +transpose(X,12) ) ) +arpeggio(transpose(arpeggio(X) ,4) ) ) ,7) ) ,-5) ) ) ,12) ) ) ,12) ) ,4) +arpeggio(((shuffle(((((transpose((((X+X) +transpose(X,4) ) +transpose(X,7) ) ,-5) |transpose(transpose(X,-7) ,-7) ) +(echo((X|X) ,4,6) |arpeggio((X|X) ) ) ) +(arpeggio(step(X,12) ) +(((X+(X|X) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ) +transpose(step(X,12) ,7) ) ) ) |step((((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((step(X,12) |echo(X,4,6) ) ,7) ) |(((X+transpose(X,12) ) +transpose(transpose(((X+transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ,-7) ,4) ) +transpose(transpose((shuffle(X) +transpose(shuffle(X) ,7) ) ,4) ,7) ) ) ,12) ) ) +transpose(echo(transpose(((X|X) +transpose(((X+transpose(X,12) ) +transpose(X,7) ) ,7) ) ,-5) ,4,6) ,7) ) +transpose(transpose(transpose(transpose(echo(transpose(arpeggio(X) ,-5) ,4,6) ,-5) ,-5) ,4) ,7) ) ) ) ) random seed used was 136404145
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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