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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 15 generations the expression "X" became this: | step(shuffle((transpose(((transpose((echo(echo(X,4,6) ,4,6) +transpose((step(X,12) +transpose((X+X) ,7) ) ,7) ) ,-5) |transpose(arpeggio(echo(arpeggio(X) ,4,6) ) ,-5) ) +shuffle(transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,-5) ) ) ,-7) +echo(transpose(transpose(((step(X,12) +transpose((X+X) ,7) ) +((X+transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) ) ,4) ,-7) ,4,6) ) ) ,12) random seed used was 7
EXPR = step(shuffle((shuffle(shuffle(step(transpose(transpose(transpose(X,-5) ,-5) ,-7) ,12) ) ) |transpose(echo(echo(step((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) ,12) ,4,6) ,4,6) ,4) ) ) ,12) random seed used was 0
EXPR = ((((shuffle((echo(echo(transpose(X,-5) ,4,6) ,4,6) +transpose(((((X+transpose(X,12) ) +transpose(arpeggio(step(X,12) ) ,4) ) +transpose(X,7) ) +arpeggio(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) ,7) ) ) +transpose(echo((((((X+transpose(transpose(echo(transpose(X,-7) ,4,6) ,4) ,4) ) +transpose(step(shuffle(shuffle((X+transpose(X,12) ) ) ) ,12) ,7) ) +transpose((((X+transpose(transpose(step(X,12) ,-7) ,4) ) +transpose(((X+transpose((X|X) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) +transpose(transpose(transpose(echo(X,4,6) ,4) ,-5) ,7) ) ,12) ) +transpose(((((((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) ,-7) +transpose(((((X+transpose(X,12) ) |shuffle(X) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X+X) ,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(echo((X+((arpeggio(X) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,4,6) ,4) ) +transpose(echo(step((X+X) ,12) ,4,6) ,7) ) +transpose((transpose(X,-5) +X) ,4) ) +transpose(step(((X+transpose(X,7) ) |echo(arpeggio(X) ,4,6) ) ,12) ,7) ) ,4) ) +transpose(shuffle(arpeggio((arpeggio(X) |shuffle(X) ) ) ) ,7) ) ,4,6) ,4) ) +transpose((arpeggio(shuffle((arpeggio(transpose(transpose((X+transpose((X|X) ,12) ) ,4) ,-7) ) +(echo(((X+transpose(echo(X,4,6) ,4) ) +transpose((((X+transpose(X,12) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,7) ) ,4,6) +arpeggio(arpeggio((X+transpose(X,12) ) ) ) ) ) ) ) |step(transpose(transpose(echo(((((((X|X) |X) +transpose(shuffle(X) ,4) ) +transpose(shuffle(X) ,7) ) +transpose(echo(transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4) ,4,6) ,4) ) +transpose(step(((((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,12) ,7) ) ,4,6) ,-5) ,4) ,12) ) ,7) ) +transpose(((echo((transpose((((echo(X,4,6) |(X|(step(X,12) +echo(X,4,6) ) ) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) |(((transpose(((shuffle(step(X,12) ) +transpose(shuffle((X+X) ) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ,4) +arpeggio((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) |arpeggio(X) ) ) ) +transpose((((transpose(shuffle(echo(X,4,6) ) ,-7) +transpose(transpose(transpose((((((X+X) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) +transpose((step(X,12) +transpose(shuffle(X) ,12) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,-5) ,-5) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) +transpose(shuffle((((X+transpose((transpose(step(X,12) ,-5) +transpose(arpeggio(X) ,7) ) ,12) ) |echo(((X+X) |arpeggio(transpose(X,4) ) ) ,4,6) ) |((echo(echo(X,4,6) ,4,6) +transpose(arpeggio(arpeggio(shuffle(X) ) ) ,4) ) +transpose(arpeggio(((X+transpose(((X+transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(X,7) ) ) ,7) ) ) ) ,12) ) ,4) ) +transpose((arpeggio((arpeggio((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) ) |echo(arpeggio((X+transpose(X,12) ) ) ,4,6) ) ) +transpose(((((step(((X+X) |(echo(X,4,6) +shuffle(X) ) ) ,12) +transpose(transpose(((((shuffle(X) +transpose(arpeggio(X) ,4) ) +transpose(step(X,12) ,7) ) +transpose(arpeggio((X|X) ) ,4) ) +transpose(arpeggio(transpose(X,-5) ) ,7) ) ,4) ,4) ) +transpose(step(echo(X,4,6) ,12) ,7) ) +transpose(arpeggio(transpose(echo(X,4,6) ,-7) ) ,4) ) +transpose(echo((shuffle(transpose(X,4) ) +transpose(arpeggio(echo(X,4,6) ) ,12) ) ,4,6) ,7) ) ,7) ) ,7) ) ) ,4,6) +transpose((step(arpeggio(step(shuffle(shuffle((X+X) ) ) ,12) ) ,12) |(step((((echo(transpose(X,4) ,4,6) +transpose((arpeggio(shuffle(transpose(X,-7) ) ) +(transpose(X,4) +(X+transpose(arpeggio(X) ,7) ) ) ) ,7) ) +transpose(arpeggio((shuffle(X) +transpose(X,12) ) ) ,12) ) |(((transpose(echo(shuffle(X) ,4,6) ,-5) |echo(transpose((X|transpose(transpose(X,-5) ,-5) ) ,-5) ,4,6) ) +transpose(transpose(step(shuffle(arpeggio(X) ) ,12) ,-5) ,4) ) +transpose(arpeggio(transpose(arpeggio(transpose(X,-7) ) ,-5) ) ,7) ) ) ,12) +transpose(step((arpeggio(transpose(transpose(shuffle(X) ,-5) ,4) ) +transpose(transpose(((X+transpose(X,7) ) +transpose((X+X) ,7) ) ,-5) ,-7) ) ,12) ,7) ) ) ,4) ) +transpose(arpeggio(shuffle(echo((((transpose(((arpeggio((X+X) ) +transpose(transpose(transpose(X,-5) ,-5) ,4) ) +transpose(arpeggio(X) ,7) ) ,-7) +(((((echo((X+X) ,4,6) +transpose(echo((X+transpose(X,12) ) ,4,6) ,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) |arpeggio((arpeggio(shuffle(X) ) +transpose((step(X,12) |((step(X,12) +transpose(transpose(X,-5) ,4) ) +transpose(shuffle(X) ,7) ) ) ,7) ) ) ) ) +transpose(arpeggio((((shuffle(shuffle(X) ) +(X+transpose(X,12) ) ) +transpose(((X+X) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) ,4) ) +transpose(((((X|X) +step(X,12) ) +transpose(X,4) ) +transpose((X+X) ,7) ) ,7) ) ) ,4) ) +transpose(((transpose(X,-5) |transpose(step(X,12) ,-7) ) +transpose(((arpeggio(X) +echo(transpose(X,-7) ,4,6) ) +transpose((step(transpose(X,4) ,12) +transpose(X,-5) ) ,7) ) ,12) ) ,7) ) ,4,6) ) ) ,7) ) ,4) ) +transpose(arpeggio(shuffle(arpeggio(transpose((shuffle(shuffle(shuffle((transpose(X,-5) +arpeggio(shuffle(X) ) ) ) ) ) +transpose(transpose(arpeggio(shuffle(arpeggio((X+shuffle(arpeggio(X) ) ) ) ) ) ,-7) ,12) ) ,4) ) ) ) ,7) ) random seed used was 0
NOTE: Generated phrase was too large ( 5763 ) , it has been truncated at 5000 notes.
EXPR = shuffle(transpose(transpose((((((echo(transpose(step((X+X) ,12) ,4) ,4,6) +((((step((X+transpose(X,7) ) ,12) +transpose(transpose((X+transpose(X,12) ) ,4) ,12) ) +transpose((step(X,12) |(X+((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4) ) +transpose(((shuffle(X) +transpose(transpose(X,-5) ,12) ) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(echo(X,4,6) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ,7) ) +(((X+transpose(X,-5) ) +transpose((shuffle(X) |X) ,4) ) +transpose(((X+transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ) ) +transpose(step(transpose(echo(echo(shuffle(transpose(X,4) ) ,4,6) ,4,6) ,-5) ,12) ,7) ) +transpose((transpose(transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,-5) ,-5) |shuffle(echo((shuffle(X) |shuffle(X) ) ,4,6) ) ) ,4) ) +transpose(transpose(transpose((echo(transpose((step(X,12) +transpose(echo(X,4,6) ,7) ) ,-5) ,4,6) +((transpose(X,-7) |X) +transpose((step(X,12) +transpose(arpeggio(echo(X,4,6) ) ,12) ) ,12) ) ) ,-5) ,-7) ,7) ) +transpose((((echo((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) |echo(arpeggio(X) ,4,6) ) ,4,6) +transpose(arpeggio(arpeggio((X+transpose(X,12) ) ) ) ,12) ) +transpose((arpeggio(transpose(((X|X) +X) ,4) ) +transpose(shuffle(transpose(arpeggio(X) ,-5) ) ,12) ) ,12) ) +transpose(echo(shuffle(transpose(echo(transpose(X,4) ,4,6) ,-5) ) ,4,6) ,12) ) ,12) ) ,4) ,-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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