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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 17 generations the expression "X" became this: | ((shuffle((transpose((step(transpose(arpeggio((((((X+X) +transpose((X+transpose(X,7) ) ,12) ) +transpose(X,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) |((X+X) +(X|X) ) ) ) ,-5) ,12) +transpose(arpeggio(transpose(X,-7) ) ,12) ) ,4) +transpose(transpose(echo((transpose((echo(transpose(transpose((X+transpose(X,7) ) ,4) ,-7) ,4,6) +transpose((transpose(transpose(shuffle(X) ,4) ,-7) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) +transpose(((X+transpose(X,12) ) |transpose(X,4) ) ,12) ) ,12) ) ,-7) ) ,4) +transpose((transpose((step(transpose(transpose(echo(X,4,6) ,4) ,4) ,12) +transpose(transpose(step(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,-7) ,12) ) ,-5) +transpose(((X+(X|X) ) +transpose(step(transpose(transpose((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) |(X|X) ) ,4) ,-5) ,12) ,12) ) ,7) ) ,7) ) ,4,6) ,-7) ,12) ) ) +(((step(transpose(shuffle((X+transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ) ,-5) ,12) +transpose(transpose((((transpose(shuffle((X+transpose(X,12) ) ) ,-7) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,12) ) +transpose(shuffle(transpose(X,-5) ) ,7) ) ,4) ) +transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(arpeggio(X) ,12) ) +transpose((((X|X) +transpose(X,4) ) +transpose(X,7) ) ,-5) ) ,4) ) +transpose((transpose((((((step(X,12) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |X) |(transpose(X,-5) +(X|(X+X) ) ) ) +transpose(transpose(transpose(X,4) ,-5) ,12) ) ,-7) +transpose(step(transpose(transpose(X,4) ,-7) ,12) ,7) ) ,7) ) ,-5) ,7) ) +transpose(step(transpose((transpose(transpose(X,-5) ,-5) |transpose((transpose(((((X|X) |step(X,12) ) +transpose((X+X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) +transpose(transpose(arpeggio(X) ,4) ,-5) ) ,-7) ) ,4) ,12) ,12) ) +transpose(transpose(transpose(transpose(arpeggio(step(X,12) ) ,-7) ,-7) ,-7) ,-7) ) ) +transpose(echo(echo(echo((echo((echo((echo(transpose(shuffle(X) ,-7) ,4,6) +transpose(transpose(((shuffle(X) +transpose(X,12) ) +transpose((transpose(X,-7) |X) ,12) ) ,4) ,-7) ) ,4,6) +arpeggio(transpose(((transpose((X|X) ,-7) +transpose((transpose(X,-7) +X) ,4) ) +transpose((transpose(X,-5) +(X+X) ) ,7) ) ,4) ) ) ,4,6) +(transpose(transpose(transpose(((((X+transpose(X,7) ) |X) +transpose((X|X) ,7) ) +transpose((step((step(X,12) +transpose(step(X,12) ,7) ) ,12) +transpose((((X+X) +X) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) ,7) ) ,4) ,-7) ,4) |(((shuffle((shuffle(transpose(X,-7) ) +transpose((transpose((X+transpose(X,7) ) ,4) +transpose(transpose(X,-5) ,4) ) ,7) ) ) +transpose(((((transpose(X,-5) +transpose(transpose((((transpose(X,-5) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,4) ,7) ) |(X|X) ) ,4) ,4) ) +transpose(echo((((X+X) |X) +shuffle(X) ) ,4,6) ,7) ) +transpose(transpose(transpose(X,4) ,-5) ,4) ) +transpose(transpose(((X+transpose(step(X,12) ,7) ) +transpose(X,-5) ) ,4) ,7) ) ,4) ) +transpose(step(((transpose(echo(X,4,6) ,-7) +transpose((X+transpose(echo(X,4,6) ,12) ) ,7) ) +(transpose(echo(X,4,6) ,-5) +transpose(transpose(arpeggio(echo(X,4,6) ) ,4) ,12) ) ) ,12) ,7) ) |((transpose(X,4) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ) ) ) ,4,6) ,4,6) ,4,6) ,-7) ) random seed used was 16
NOTE: Generated phrase was too large ( 124839 ) , it has been truncated at 5000 notes.
EXPR = transpose((echo(((transpose(transpose((transpose(transpose(step(X,12) ,-5) ,-7) |((((transpose(X,-5) +transpose(transpose((X+X) ,-5) ,7) ) +transpose(arpeggio(shuffle(X) ) ,12) ) +transpose(transpose((transpose(X,-7) +transpose((X|X) ,12) ) ,4) ,-7) ) +transpose(transpose((transpose((X+transpose(X,12) ) ,4) +step((X+transpose(X,12) ) ,12) ) ,-7) ,12) ) ) ,-5) ,-7) +transpose((((step(transpose(((echo((step(X,12) +step(shuffle(X) ,12) ) ,4,6) +transpose(transpose((arpeggio(echo(((X|X) +transpose(transpose(X,-5) ,12) ) ,4,6) ) +transpose(((X+X) +transpose(echo(X,4,6) ,12) ) ,7) ) ,-5) ,4) ) +transpose(echo(transpose(transpose(shuffle((X+transpose(X,12) ) ) ,-5) ,-5) ,4,6) ,7) ) ,-7) ,12) +transpose(transpose(step(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(((arpeggio(X) +shuffle(X) ) +transpose((transpose(X,4) |X) ,12) ) ,4) ) +transpose(arpeggio(transpose(transpose(transpose(X,4) ,-5) ,-7) ) ,7) ) ,12) ,-7) ,4) ) +transpose((transpose(step((echo((X|(X+transpose(X,12) ) ) ,4,6) |X) ,12) ,4) |arpeggio(transpose(X,-5) ) ) ,7) ) +(shuffle(transpose((transpose(shuffle(transpose(transpose(X,-5) ,-5) ) ,4) +transpose((((transpose((((X+transpose(X,7) ) |transpose(X,-7) ) |((X+transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) ) ,-7) +transpose(step((echo(X,4,6) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,4) ) +transpose(arpeggio((X|(X+X) ) ) ,7) ) +transpose((((step(X,12) +step(X,12) ) +(shuffle(transpose(X,-5) ) |arpeggio(X) ) ) |echo(arpeggio(transpose(X,4) ) ,4,6) ) ,12) ) ,7) ) ,4) ) |transpose(transpose((echo(transpose(transpose(transpose(transpose((X|X) ,-7) ,-7) ,4) ,4) ,4,6) |transpose(arpeggio(transpose((X+transpose((X+transpose(X,12) ) ,7) ) ,4) ) ,-5) ) ,4) ,-5) ) ) ,12) ) +transpose(transpose(arpeggio(shuffle(transpose(echo(((shuffle((X|(transpose(X,-5) +transpose(X,7) ) ) ) |((transpose(X,4) +transpose(step(X,12) ,7) ) |X) ) +transpose(echo(X,4,6) ,12) ) ,4,6) ,-7) ) ) ,4) ,7) ) ,4,6) |transpose((transpose((transpose(transpose(transpose(transpose((transpose(transpose(step(X,12) ,4) ,4) +transpose((shuffle(X) |(X+X) ) ,12) ) ,-5) ,4) ,-5) ,-7) +transpose(((echo((((X+X) +transpose(X,4) ) +transpose(X,7) ) ,4,6) +(transpose(echo(X,4,6) ,4) |transpose(transpose(X,-7) ,-7) ) ) +(step(echo(((X|X) |X) ,4,6) ,12) +arpeggio((X+transpose(X,12) ) ) ) ) ,-5) ) ,-7) +transpose(transpose(((transpose(transpose(step(X,12) ,4) ,-5) +transpose((echo(X,4,6) |((X|(X|X) ) +transpose(transpose(X,-5) ,7) ) ) ,12) ) +transpose((transpose((X|X) ,-5) +transpose(((transpose((X+X) ,-7) +transpose(transpose((X|X) ,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,12) ) ,-5) ,12) ) ,-5) ) ,-5) random seed used was 0
EXPR = echo(transpose(transpose((transpose((((transpose(shuffle(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ) ,-7) +transpose((transpose((X+X) ,4) +shuffle((X+transpose(X,12) ) ) ) ,4) ) +transpose(((shuffle((X+X) ) |X) +transpose((X+transpose(X,7) ) ,7) ) ,7) ) +(echo((X|X) ,4,6) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ) ,-5) +(transpose(transpose(transpose((X|X) ,-7) ,-5) ,-7) |transpose((transpose((((step((X+transpose(X,12) ) ,12) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose((X+X) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) +((X|X) +transpose(((X+X) +transpose(X,-7) ) ,12) ) ) ,-7) +transpose(arpeggio(arpeggio(X) ) ,7) ) ,4) ) ) ,4) ,4) ,4,6) random seed used was 0
EXPR = (arpeggio(transpose(transpose(echo(transpose(arpeggio(step(transpose((X|X) ,4) ,12) ) ,-7) ,4,6) ,-7) ,-5) ) |transpose(transpose(transpose((((X+transpose(echo(X,4,6) ,7) ) +((transpose(transpose(transpose(X,-7) ,4) ,-7) +transpose(shuffle(step(X,12) ) ,4) ) +transpose(echo(echo((X|X) ,4,6) ,4,6) ,7) ) ) +((echo(transpose(transpose(X,-5) ,4) ,4,6) +transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) |transpose(X,-7) ) ,4) ) +transpose((((X+X) +transpose(X,4) ) +transpose(X,12) ) ,7) ) ) ,-7) ,-5) ,4) ) 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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