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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: | ((transpose(arpeggio((transpose(transpose(((step(X,12) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) +echo(X,4,6) ) ,-7) ,-5) |echo(echo(X,4,6) ,4,6) ) ) ,-5) +(echo(echo((echo((echo(transpose(step(step(X,12) ,12) ,-7) ,4,6) |transpose(echo(X,4,6) ,4) ) ,4,6) |step(step(echo(((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4,6) ,12) ,12) ) ,4,6) ,4,6) +transpose((transpose(shuffle((((transpose(((shuffle(X) |echo(X,4,6) ) +transpose(echo(X,4,6) ,12) ) ,-5) +transpose((arpeggio(transpose(X,-5) ) +transpose(((X|transpose(X,4) ) +transpose(arpeggio(arpeggio(X) ) ,12) ) ,12) ) ,4) ) +transpose((transpose(step(transpose(X,4) ,12) ,-7) +X) ,7) ) |transpose(X,-7) ) ) ,-7) +transpose(transpose(echo((arpeggio(X) +transpose(((X+transpose(X,7) ) |transpose((transpose(X,-7) +transpose(X,12) ) ,-5) ) ,7) ) ,4,6) ,-5) ,4) ) ,12) ) ) |step(step(((step(shuffle(X) ,12) +transpose(transpose(echo(X,4,6) ,-7) ,12) ) +transpose(((((echo(X,4,6) +X) +transpose(echo(X,4,6) ,12) ) +transpose(step(X,12) ,12) ) +transpose(shuffle(X) ,7) ) ,7) ) ,12) ,12) ) random seed used was 9
NOTE: Generated phrase was too large ( 5922 ) , it has been truncated at 5000 notes.
EXPR = transpose(step((arpeggio(transpose(shuffle(transpose(transpose((X+transpose(X,12) ) ,-7) ,4) ) ,-7) ) +transpose((((transpose((X+transpose(echo(X,4,6) ,7) ) ,4) +transpose(((transpose(transpose(X,-5) ,-5) +transpose(transpose(step(transpose(X,-5) ,12) ,-5) ,4) ) +transpose(transpose(((X+transpose(step(X,12) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-7) ,7) ) ,7) ) +transpose(shuffle(shuffle((transpose(X,-5) +transpose(((X+transpose(X,12) ) |transpose(X,-7) ) ,12) ) ) ) ,4) ) +transpose(((echo(transpose(arpeggio(X) ,-7) ,4,6) +transpose(shuffle(transpose(X,-7) ) ,4) ) +transpose((((X+transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) +echo(transpose(X,-5) ,4,6) ) ,7) ) ,7) ) ,12) ) ,12) ,-7) random seed used was 0
EXPR = transpose(arpeggio((transpose(((transpose(((transpose(((X+transpose(X,7) ) +transpose(transpose(X,4) ,12) ) ,-7) +((X+transpose(X,12) ) +transpose((X|X) ,7) ) ) +transpose(transpose(transpose(transpose(transpose(arpeggio(((X+transpose(X,12) ) +transpose(X,7) ) ) ,-5) ,-7) ,-7) ,-5) ,7) ) ,-5) +transpose(echo(((((arpeggio((transpose(X,-5) +transpose(X,12) ) ) +shuffle(X) ) +transpose((((shuffle(X) +step((X+transpose(X,7) ) ,12) ) +transpose(shuffle(X) ,-7) ) +((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,4) ) +transpose((transpose((step(X,12) +transpose((X+transpose(X,7) ) ,7) ) ,-5) |arpeggio(transpose(X,4) ) ) ,7) ) +(arpeggio(transpose(X,-7) ) +transpose(((((((X+transpose(X,12) ) +transpose(echo(X,4,6) ,12) ) +transpose(transpose(X,-7) ,12) ) +transpose(transpose(arpeggio(X) ,-7) ,12) ) +transpose(echo(transpose(((X+transpose(X,7) ) +transpose((shuffle(X) +transpose(transpose(X,-7) ,12) ) ,7) ) ,4) ,4,6) ,4) ) +transpose((((X|X) +transpose((shuffle(X) +transpose(echo(X,4,6) ,7) ) ,7) ) +transpose((transpose(X,-5) |X) ,12) ) ,7) ) ,12) ) ) ,4,6) ,4) ) +transpose((echo(echo((transpose(transpose(X,-7) ,-5) +transpose(((transpose(transpose(X,-7) ,4) +transpose(step(transpose(X,-7) ,12) ,4) ) +transpose((transpose(X,-7) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,12) ) ,4,6) ,4,6) |transpose(transpose(transpose((X|X) ,4) ,-7) ,4) ) ,7) ) ,-5) +transpose(((transpose(transpose(((transpose(X,-7) +transpose(shuffle(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) ,-7) |(transpose((transpose((X+transpose(X,7) ) ,-7) +transpose(((X+transpose(X,7) ) +transpose(step(X,12) ,12) ) ,7) ) ,-5) |transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ) ) +transpose(((arpeggio(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ) +transpose(((X+transpose(X,7) ) |(X+transpose(X,7) ) ) ,4) ) +transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(((arpeggio(X) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,12) ) ,12) ) ) ,-5) random seed used was 0
EXPR = (arpeggio((((transpose((((shuffle(transpose(((arpeggio(X) +transpose(X,7) ) +transpose((X+X) ,7) ) ,-5) ) +transpose((shuffle(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ) +transpose(((echo(X,4,6) +transpose(echo(X,4,6) ,12) ) +transpose(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,12) ) ,-5) ,7) ) ,12) ) ,4) ) +transpose(transpose(transpose(transpose(X,4) ,-5) ,-5) ,7) ) |(shuffle(((transpose((X+X) ,-7) |transpose(X,4) ) +transpose((step(((X+transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,12) +transpose(transpose(X,-5) ,12) ) ,12) ) ) +transpose(transpose((transpose(shuffle(arpeggio(X) ) ,-7) +transpose((transpose((X+transpose(X,12) ) ,-5) +((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ) ,4) ) ,4) ,7) ) ) ,4) +transpose(step((transpose(((transpose(((transpose(X,4) +transpose((transpose(X,4) |(X+X) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,-7) |transpose(step((shuffle(X) |(X+transpose(X,12) ) ) ,12) ,-7) ) +transpose(transpose((((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(step(X,12) ,7) ) |shuffle((echo(X,4,6) +transpose(echo(X,4,6) ,12) ) ) ) ,-5) ,4) ) ,-5) +transpose((transpose((((transpose((echo(X,4,6) |X) ,-5) +transpose(arpeggio((echo(X,4,6) +arpeggio(X) ) ) ,12) ) |transpose(transpose(transpose(transpose(X,-5) ,-5) ,-7) ,-5) ) +transpose(((shuffle(transpose(transpose(X,4) ,-5) ) +transpose(shuffle(X) ,12) ) +transpose((transpose(X,-5) |echo(X,4,6) ) ,7) ) ,12) ) ,-7) +transpose((((transpose(X,-7) +transpose(step(X,12) ,4) ) +transpose(transpose(X,4) ,7) ) +transpose(echo(X,4,6) ,7) ) ,-5) ) ,12) ) ,12) ,7) ) +transpose((step(arpeggio((((X+transpose(transpose(transpose(X,-7) ,-5) ,7) ) +transpose(((transpose(((echo(X,4,6) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) ,-5) +transpose(arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,12) ) +transpose(transpose(transpose(echo(X,4,6) ,-5) ,-7) ,12) ) ,12) ) +transpose((transpose(echo(X,4,6) ,-7) +transpose(arpeggio(X) ,7) ) ,7) ) ) ,12) |echo((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,4,6) ) ,4) ) +transpose((transpose(echo(arpeggio(shuffle(((X+transpose(X,7) ) +echo(X,4,6) ) ) ) ,4,6) ,-7) +transpose(step(transpose(shuffle((transpose(echo(X,4,6) ,-5) +transpose(transpose((X|(X+transpose(X,12) ) ) ,-5) ,12) ) ) ,-7) ,12) ,12) ) ,7) ) ) +transpose((transpose(transpose(((transpose(transpose(arpeggio((shuffle(transpose(transpose(X,-7) ,-5) ) +transpose((X+transpose(X,7) ) ,12) ) ) ,-7) ,-7) +transpose((transpose(echo(X,4,6) ,4) +transpose(transpose(X,-5) ,7) ) ,4) ) +transpose(transpose(arpeggio(transpose((transpose(X,-5) +shuffle(X) ) ,-7) ) ,-5) ,7) ) ,-7) ,4) +transpose(step((transpose(transpose(echo((transpose((X+transpose(transpose(arpeggio(X) ,-7) ,12) ) ,-5) +transpose((step(echo(shuffle(X) ,4,6) ,12) +transpose(transpose((X+transpose(X,12) ) ,-7) ,12) ) ,12) ) ,4,6) ,-7) ,-5) +(transpose(((((transpose(transpose(transpose((echo(X,4,6) +transpose(step(X,12) ,12) ) ,-5) ,-5) ,-7) +transpose(transpose(step(echo((X+transpose(X,7) ) ,4,6) ,12) ,4) ,4) ) +transpose(((arpeggio(X) +transpose(transpose(X,4) ,7) ) +transpose(shuffle(transpose(X,-5) ) ,12) ) ,7) ) +transpose((transpose(((transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,4) +transpose(shuffle(transpose(transpose(X,4) ,-5) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,-7) +transpose(shuffle((X+shuffle(X) ) ) ,7) ) ,12) ) +transpose(shuffle(echo(transpose(echo((echo(transpose(X,4) ,4,6) |((X+transpose(X,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ,-5) ,4,6) ) ,12) ) ,-5) +transpose(transpose(step(step(((X+transpose(transpose(X,-5) ,12) ) +transpose((arpeggio((X|X) ) +transpose(X,12) ) ,12) ) ,12) ,12) ,-7) ,7) ) ) ,12) ,7) ) ,12) ) 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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