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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: | step((echo((step(transpose(transpose(echo(echo(((transpose(X,4) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,4,6) ,4,6) ,-5) ,-5) ,12) +transpose((step((echo(X,4,6) |arpeggio((X|(X+step(X,12) ) ) ) ) ,12) +transpose(transpose(step(transpose(X,4) ,12) ,4) ,7) ) ,12) ) ,4,6) +transpose((transpose((transpose(transpose(transpose(arpeggio(shuffle(transpose(X,4) ) ) ,-7) ,-7) ,-5) +transpose(step((step((arpeggio(X) +echo(X,4,6) ) ,12) +(X+transpose((X|X) ,12) ) ) ,12) ,-5) ) ,-5) +transpose(((echo(((echo(X,4,6) +transpose(X,4) ) +transpose((X|X) ,7) ) ,4,6) +transpose(transpose(((echo(X,4,6) +(X|X) ) +transpose(((X+X) +transpose(X,4) ) ,7) ) ,-5) ,7) ) +transpose(transpose(step((transpose((X+X) ,-5) +transpose(X,-5) ) ,12) ,-5) ,4) ) ,4) ) ,7) ) ,12) random seed used was 6
EXPR = ((echo(transpose((transpose((transpose(((shuffle(echo(echo(step(X,12) ,4,6) ,4,6) ) |echo(step(arpeggio(transpose(X,-5) ) ,12) ,4,6) ) +transpose(arpeggio((arpeggio(X) +transpose((transpose(transpose(X,4) ,4) +transpose(shuffle(transpose(X,4) ) ,-7) ) ,7) ) ) ,7) ) ,4) |transpose(echo(((echo((X+X) ,4,6) |step(((X+transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,12) ) +((((X|echo(X,4,6) ) +transpose(transpose(echo(X,4,6) ,4) ,4) ) +transpose(echo(X,4,6) ,7) ) +((X|X) +transpose(X,7) ) ) ) ,4,6) ,4) ) ,-5) +transpose(transpose(echo(echo(transpose(transpose(transpose((transpose(X,4) |echo(X,4,6) ) ,-5) ,-5) ,4) ,4,6) ,4,6) ,4) ,12) ) ,-7) ,4,6) +transpose(((transpose((shuffle(transpose((transpose(X,-5) +transpose(arpeggio(shuffle(arpeggio(X) ) ) ,7) ) ,4) ) +(transpose(echo(X,4,6) ,4) +transpose(step(transpose(transpose(X,-5) ,4) ,12) ,-5) ) ) ,4) +transpose(transpose((((transpose(transpose((((X+transpose(X,12) ) +transpose(X,7) ) +X) ,-5) ,-5) +transpose(echo(((transpose(X,-5) +transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ,4,6) ,7) ) +transpose(arpeggio(((((X|X) +step(X,12) ) |transpose(step(X,12) ,-5) ) +transpose((step(transpose(X,4) ,12) +transpose((X|transpose(X,4) ) ,-7) ) ,12) ) ) ,4) ) +transpose(transpose((((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) +transpose((shuffle(X) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) +transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,4) ) +transpose((transpose(X,-7) +transpose(transpose(X,4) ,12) ) ,7) ) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +transpose(echo(transpose(X,4) ,4,6) ,4) ) +transpose((transpose(X,4) +transpose(X,4) ) ,7) ) ,4) ) +transpose(echo(echo((arpeggio(X) |X) ,4,6) ,4,6) ,7) ) ,4) ,7) ) ,4) ,7) ) +transpose(arpeggio((transpose((((((shuffle(X) +transpose(arpeggio(X) ,12) ) +transpose(step((X+X) ,12) ,7) ) |(X+X) ) +(echo(X,4,6) +transpose(arpeggio(X) ,-7) ) ) +transpose(arpeggio((transpose(transpose(X,-5) ,4) +((X|(X+transpose(X,12) ) ) +(X+transpose(X,7) ) ) ) ) ,7) ) ,-7) |transpose((transpose(transpose((X|X) ,4) ,-7) +(((X+X) +(X+X) ) +transpose(echo(X,4,6) ,7) ) ) ,-7) ) ) ,7) ) ,4) ) +transpose(((shuffle(echo(((shuffle(transpose(X,-7) ) +X) |(X+step(transpose(X,-7) ,12) ) ) ,4,6) ) |(((shuffle(shuffle(transpose(((X|(X|X) ) +X) ,-7) ) ) |transpose(step(step((X|X) ,12) ,12) ,4) ) +arpeggio(((((transpose(X,4) +(X|X) ) +((X+transpose(X,12) ) +(transpose(X,4) |X) ) ) |transpose(shuffle(transpose(X,-5) ) ,-5) ) +transpose(transpose(echo(transpose(X,-5) ,4,6) ,-5) ,7) ) ) ) +transpose(transpose(transpose((transpose(X,-7) |((transpose((((X+transpose(X,12) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(step(X,12) ,7) ) ,-7) +transpose(echo(X,4,6) ,-7) ) +((step(X,12) |X) +transpose((X|((shuffle(X) +transpose(transpose(X,-7) ,4) ) +transpose(shuffle(X) ,7) ) ) ,12) ) ) ) ,-7) ,-5) ,12) ) ) +echo(transpose(transpose((shuffle((echo((transpose(X,4) |X) ,4,6) +((shuffle((transpose(X,-7) +transpose(X,-7) ) ) |(((transpose(X,4) |shuffle(X) ) +transpose((arpeggio(X) +X) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ) +transpose((transpose(shuffle(X) ,-7) +transpose(arpeggio(transpose((X+transpose(X,12) ) ,-7) ) ,12) ) ,12) ) ) ) +transpose((shuffle(shuffle(((transpose((X+X) ,4) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |((X+transpose((X|X) ,4) ) +transpose((X|X) ,7) ) ) ,7) ) +(transpose(X,-5) +arpeggio(transpose(X,-7) ) ) ) ) ) |((step(((transpose(transpose((X+transpose(X,12) ) ,-7) ,-5) +transpose(((transpose(X,-5) +echo(X,4,6) ) |((X+transpose(X,-7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,4) ) +transpose(transpose((X|X) ,-7) ,7) ) ,12) +transpose(echo(echo(X,4,6) ,4,6) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,7) ) ,-7) ,4) ,4,6) ) ,7) ) random seed used was 0
NOTE: Generated phrase was too large ( 9088 ) , it has been truncated at 5000 notes.
EXPR = (echo(transpose((transpose(echo(shuffle((transpose(X,4) +X) ) ,4,6) ,-5) +(arpeggio(echo(((((transpose(X,-7) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose(X,4) ) +transpose(transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,-7) ,7) ) ,4,6) ) +transpose(((((((X+transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((arpeggio(X) +transpose(X,7) ) ,12) ) +transpose(transpose(transpose(transpose(transpose(step(X,12) ,-7) ,-5) ,4) ,-5) ,7) ) +(transpose(((X|X) +transpose((X+X) ,12) ) ,-7) |((transpose(transpose((shuffle(step(X,12) ) +X) ,-7) ,-5) +transpose(transpose(arpeggio((X|X) ) ,-5) ,4) ) +transpose(step(echo((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,4,6) ,12) ,7) ) ) ) ,-5) ) ) ,-5) ,4,6) +transpose(echo(((shuffle(transpose(transpose((transpose(X,-7) +transpose(arpeggio(X) ,12) ) ,4) ,4) ) +transpose((echo(transpose(transpose(shuffle((transpose((X+transpose(X,7) ) ,-7) +transpose(X,4) ) ) ,4) ,-7) ,4,6) +transpose(transpose((echo(X,4,6) |transpose((arpeggio(transpose(X,-5) ) +(transpose(X,4) +(X+X) ) ) ,4) ) ,-5) ,12) ) ,4) ) +transpose((transpose((transpose(X,-7) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,4) +transpose((shuffle(transpose((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) ,-5) ) +transpose((((((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) |(((X+X) +transpose(step(X,12) ,4) ) +transpose(X,7) ) ) +transpose((shuffle(X) +transpose(X,7) ) ,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) +transpose(transpose((arpeggio(X) +(X+transpose(X,12) ) ) ,4) ,4) ) ,12) ) ,7) ) ,7) ) ,4,6) ,4) ) random seed used was 0
EXPR = arpeggio((((transpose((shuffle(X) +transpose((shuffle(X) +transpose(X,-5) ) ,4) ) ,-7) |((transpose((((X+X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,-5) +transpose(transpose(shuffle(X) ,4) ,7) ) +transpose(transpose((echo((X+step(X,12) ) ,4,6) +step(X,12) ) ,-7) ,12) ) ) |(echo((echo((X+(X+transpose(X,7) ) ) ,4,6) +(((X|X) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ) ,4,6) +transpose((transpose(shuffle((X+X) ) ,4) |((X+transpose(arpeggio(X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) ,-7) ) ) |transpose((transpose((((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) |transpose(X,4) ) |(X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,-5) |arpeggio(((echo(X,4,6) +transpose((X|X) ,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) |(X+(X+transpose(X,7) ) ) ) ,7) ) ) ) ,-5) ) ) 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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