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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 18 generations the expression "X" became this: | (((transpose(transpose((((transpose(transpose((X|X) ,-5) ,-5) +shuffle(arpeggio(transpose(transpose(arpeggio(((X+transpose(X,12) ) +transpose(arpeggio(X) ,7) ) ) ,-5) ,4) ) ) ) +(transpose(step(transpose(transpose((X|shuffle(X) ) ,-7) ,-5) ,12) ,-5) +transpose((transpose(transpose(((shuffle(X) +transpose(transpose(X,-5) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-5) ,4) +transpose(((transpose((((X+transpose(X,7) ) +transpose(X,12) ) +X) ,-5) +transpose(transpose(shuffle(((X|X) +transpose(echo(X,4,6) ,7) ) ) ,4) ,12) ) +transpose(step(transpose(X,4) ,12) ,12) ) ,12) ) ,12) ) ) |(shuffle(transpose(transpose(arpeggio((step((X+X) ,12) +transpose(X,12) ) ) ,-7) ,4) ) |((transpose(X,-5) +transpose(((X+transpose(X,12) ) +X) ,4) ) +transpose(transpose((X+transpose(X,12) ) ,-5) ,7) ) ) ) ,4) ,4) +transpose((transpose(shuffle(arpeggio(transpose(echo(((arpeggio((transpose((X|X) ,-5) +((X+X) +X) ) ) +transpose(echo(((shuffle(X) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4,6) ,4) ) +transpose((echo(((shuffle(X) |(X|X) ) |(X+transpose(arpeggio(X) ,12) ) ) ,4,6) |(((transpose((X+transpose(X,12) ) ,4) +echo(X,4,6) ) +transpose(arpeggio((X+transpose(X,12) ) ) ,-5) ) +transpose((step(X,12) |(transpose(X,-7) +echo(X,4,6) ) ) ,-7) ) ) ,7) ) ,4,6) ,-7) ) ) ,-5) +transpose((transpose(transpose(((shuffle(transpose(transpose(transpose(step(X,12) ,-7) ,-5) ,4) ) +transpose((((X+X) +transpose((X+transpose(X,7) ) ,7) ) +transpose(echo(transpose(transpose(X,-7) ,-5) ,4,6) ,12) ) ,7) ) |(shuffle((arpeggio(X) +transpose(transpose(X,-5) ,-7) ) ) +((((((X+X) +transpose(X,7) ) |(X|shuffle(X) ) ) +transpose(transpose(X,-5) ,4) ) +transpose((transpose((X+X) ,-5) |X) ,7) ) +transpose(((X+transpose(step(X,12) ,12) ) +shuffle(X) ) ,7) ) ) ) ,-5) ,-7) +(shuffle(transpose(step((shuffle((transpose((transpose(X,4) |X) ,-7) +transpose(transpose((X|X) ,-5) ,-5) ) ) +transpose((((transpose(X,-5) |transpose(X,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) ,7) ) |(X+transpose((X|X) ,12) ) ) ,-5) ) ,12) ,-7) ) |transpose(transpose((transpose(((transpose((X+X) ,-5) +transpose(((X|X) +transpose(X,7) ) ,4) ) +transpose((echo(X,4,6) +transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,-7) |transpose(echo((((X+transpose(X,4) ) +transpose((X+X) ,7) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ,4) ) ,-7) ,-5) ) ) ,12) ) ,4) ) +transpose(transpose(echo(((((((((transpose((transpose(transpose((X|(X+X) ) ,-7) ,4) |transpose((((transpose(X,-5) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +(X+transpose(X,12) ) ) ,-5) ) ,4) +transpose(shuffle(X) ,-5) ) +transpose((transpose((((X+transpose(X,7) ) +transpose((step(X,12) +transpose(shuffle(X) ,7) ) ,12) ) +transpose((X|shuffle(X) ) ,12) ) ,4) +transpose(transpose(step(transpose((X|(X+X) ) ,4) ,12) ,-5) ,12) ) ,12) ) +transpose(echo(transpose(arpeggio(transpose((((((X+X) +transpose(X,7) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) +transpose((transpose(X,4) +transpose(arpeggio(X) ,12) ) ,12) ) |transpose(transpose((X|X) ,-7) ,-5) ) ,-5) ) ,4) ,4,6) ,7) ) +transpose(transpose(transpose(transpose(transpose((transpose((transpose(X,-7) +X) ,4) +transpose((transpose(transpose(X,4) ,-7) +transpose(echo((X|X) ,4,6) ,7) ) ,12) ) ,-5) ,-7) ,-5) ,4) ,4) ) +transpose((transpose(transpose(transpose((((transpose(X,4) +transpose((X|X) ,4) ) +transpose((arpeggio(X) +transpose(X,7) ) ,7) ) +transpose((transpose(transpose(X,-7) ,4) +(transpose((X|X) ,4) +((X+transpose(X,7) ) |shuffle(X) ) ) ) ,7) ) ,-7) ,-5) ,-5) |transpose(transpose(transpose((transpose((((X|X) +X) +(transpose(X,4) +transpose(transpose(X,4) ,7) ) ) ,4) +transpose(((X|X) +transpose(step(X,12) ,7) ) ,12) ) ,-5) ,-5) ,4) ) ,7) ) +transpose(transpose(((echo((transpose((step(transpose(echo(step(X,12) ,4,6) ,4) ,12) +transpose(shuffle((transpose(arpeggio(transpose(X,4) ) ,4) +transpose(echo(transpose(X,-7) ,4,6) ,7) ) ) ,12) ) ,-7) +transpose(transpose(step(X,12) ,-7) ,7) ) ,4,6) +transpose(transpose(transpose(step((transpose(arpeggio(X) ,4) +transpose(step(((X|X) +transpose(transpose(X,4) ,4) ) ,12) ,12) ) ,12) ,-5) ,-7) ,4) ) +transpose((transpose(transpose(step(step(step(X,12) ,12) ,12) ,4) ,-5) +transpose(transpose(((transpose((X+transpose(X,-5) ) ,-5) +transpose(step(X,12) ,7) ) |(transpose(transpose(X,-5) ,-7) |transpose((echo(X,4,6) +transpose(arpeggio((X+X) ) ,12) ) ,-5) ) ) ,-5) ,12) ) ,7) ) ,4) ,12) ) +transpose(arpeggio(transpose(((((transpose((X+X) ,4) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(X,7) ) +transpose((echo((transpose(transpose(X,-7) ,4) +transpose(X,7) ) ,4,6) |((transpose(arpeggio(X) ,4) +transpose((transpose(X,-5) +X) ,7) ) +transpose(transpose((arpeggio(((X+transpose(X,12) ) +(X+X) ) ) |(transpose((X|X) ,4) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ) ,-5) ,12) ) ) ,7) ) |(transpose((transpose(shuffle(((X+X) +transpose((X+X) ,-7) ) ) ,-7) +transpose((X|transpose((transpose(X,4) |X) ,-5) ) ,12) ) ,4) +transpose(transpose(step((step(shuffle(X) ,12) +(X+(X+transpose(X,12) ) ) ) ,12) ,4) ,4) ) ) ,4) ) ,4) ) +transpose(arpeggio((((transpose(echo(transpose(transpose(X,-5) ,-5) ,4,6) ,-7) +transpose((transpose(X,-5) |(transpose(X,-5) +transpose(X,7) ) ) ,7) ) +transpose(((transpose((((step(X,12) +(X|X) ) +transpose(((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,-5) ) +transpose(echo((X+X) ,4,6) ,7) ) ,4) ) +transpose(transpose((transpose(transpose(X,-7) ,-7) +(X|(X+transpose((X+transpose(X,7) ) ,7) ) ) ) ,4) ,7) ) ,-5) +transpose(((step(((step(X,12) +transpose(arpeggio(arpeggio(X) ) ,4) ) +transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) |transpose(shuffle(X) ,4) ) ,7) ) ,12) +transpose(step(arpeggio(transpose(((transpose(X,4) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ,-7) ) ,12) ,4) ) +transpose((shuffle((transpose(transpose(shuffle(X) ,-7) ,-5) +X) ) +transpose((transpose((transpose(X,4) |(X+X) ) ,-7) |((X+transpose(X,7) ) +(X+transpose(X,12) ) ) ) ,12) ) ,7) ) ,4) ) +transpose(((X+transpose(transpose(X,-5) ,7) ) +transpose(transpose((arpeggio(arpeggio(X) ) +transpose(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-7) ,12) ) ,-5) ,12) ) ,7) ) ,7) ) |arpeggio((transpose((echo(X,4,6) +((X|X) |X) ) ,-5) |(((X+transpose(X,12) ) +(X|X) ) +shuffle(transpose((X|X) ,4) ) ) ) ) ) ) ,7) ) ,4,6) ,-7) ,7) ) |arpeggio((step(transpose(transpose((transpose(X,-7) +transpose(transpose(X,4) ,12) ) ,-5) ,-5) ,12) |transpose(shuffle(arpeggio(echo(transpose(arpeggio(transpose(X,4) ) ,-5) ,4,6) ) ) ,4) ) ) ) random seed used was 261146246
NOTE: Generated phrase was too large ( 5670 ) , it has been truncated at 5000 notes.
EXPR = transpose(transpose(((shuffle(transpose(((((X+(X+transpose(X,7) ) ) +transpose(X,-5) ) +X) |echo((transpose(X,4) +transpose(echo((X+transpose(X,7) ) ,4,6) ,12) ) ,4,6) ) ,4) ) +transpose(transpose(arpeggio(arpeggio(shuffle(shuffle((((transpose(X,4) +transpose((X|echo(X,4,6) ) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) +transpose(echo(arpeggio(X) ,4,6) ,12) ) ) ) ) ) ,-7) ,7) ) +transpose(transpose((transpose(echo(transpose(transpose(transpose((X+X) ,-5) ,-5) ,-5) ,4,6) ,4) +transpose(shuffle((transpose((((step(X,12) +transpose((X|X) ,4) ) +transpose(step(X,12) ,7) ) +transpose(transpose(X,-5) ,4) ) ,4) +(step(transpose((((((X|X) +transpose(transpose(X,-5) ,7) ) +transpose(echo(X,4,6) ,12) ) +transpose(step((X+(X+transpose(X,12) ) ) ,12) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) ,-7) ,12) +echo(step(transpose(transpose(X,-5) ,-7) ,12) ,4,6) ) ) ) ,12) ) ,-5) ,7) ) ,-7) ,-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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