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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 20 generations the expression "X" became this: | (transpose((transpose((echo((((transpose(((((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,12) ) +transpose(transpose(((X+X) +transpose(X,4) ) ,-7) ,4) ) +transpose(((X+transpose(shuffle(transpose(X,4) ) ,4) ) +transpose(((step(transpose(X,-7) ,12) +transpose(step(X,12) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,7) ) ,-7) +transpose(echo((transpose((transpose(X,-5) +transpose((X+transpose(X,7) ) ,12) ) ,-7) |transpose(transpose((X|X) ,-7) ,-5) ) ,4,6) ,4) ) +transpose(arpeggio((arpeggio(transpose(X,4) ) +transpose(X,4) ) ) ,7) ) +transpose(shuffle(transpose(step(X,12) ,-7) ) ,7) ) ,4,6) +transpose((transpose(((transpose((step(X,12) |(X+transpose(X,12) ) ) ,-7) +transpose((transpose(echo(X,4,6) ,-7) +((step(X,12) +transpose(echo(X,4,6) ,12) ) +transpose(echo(X,4,6) ,7) ) ) ,12) ) +transpose(((((((X+transpose(X,4) ) +transpose(((transpose(X,-5) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) +transpose(step(shuffle(X) ,12) ,12) ) +transpose(transpose((X+transpose(transpose(X,-5) ,12) ) ,-7) ,12) ) +transpose(shuffle(arpeggio(((arpeggio(arpeggio(X) ) +transpose((echo(X,4,6) +X) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ) ,4) ) +transpose(echo(step(transpose(step(shuffle(X) ,12) ,-5) ,12) ,4,6) ,7) ) ,7) ) ,-7) +transpose((((transpose(arpeggio(shuffle(X) ) ,4) +transpose((((transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,4) +transpose(((((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) +transpose((X|X) ,7) ) +transpose(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,-7) ,4) ) +transpose(arpeggio(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) ,7) ) ,12) ) +transpose(step((step(X,12) +transpose((X+transpose(transpose(X,-5) ,12) ) ,7) ) ,12) ,4) ) +transpose(echo((arpeggio(X) +transpose(((X+transpose(X,12) ) +(X+transpose(X,12) ) ) ,7) ) ,4,6) ,7) ) ,4) ) +transpose(shuffle(arpeggio((shuffle(transpose(X,-5) ) +transpose(shuffle(X) ,12) ) ) ) ,7) ) +transpose(transpose((((echo((transpose(X,-7) +(X+transpose(X,7) ) ) ,4,6) |transpose((X+transpose(X,12) ) ,4) ) +transpose(echo(((((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) |((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) ) +transpose(transpose((echo(X,4,6) +transpose(transpose(X,4) ,12) ) ,-7) ,12) ) ,4,6) ,4) ) +transpose(((step((X+transpose(echo(X,4,6) ,12) ) ,12) +transpose(X,4) ) +transpose(shuffle(shuffle(transpose(X,-7) ) ) ,7) ) ,7) ) ,-7) ,7) ) ,7) ) ,12) ) ,-7) +transpose((echo(transpose((arpeggio(((transpose(echo(X,4,6) ,-7) +transpose(arpeggio(X) ,-7) ) +transpose(shuffle(((((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) +transpose(step(X,12) ,7) ) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +transpose((X+((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ,4) ) +transpose(transpose((arpeggio(X) +transpose(X,7) ) ,-7) ,7) ) ) ,12) ) ) |(transpose(shuffle(arpeggio((((X+transpose(X,12) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ) ) ,-5) |(echo((X+transpose(X,12) ) ,4,6) +transpose((((X+X) +transpose(shuffle(X) ,7) ) +transpose((shuffle(X) +transpose(X,7) ) ,12) ) ,7) ) ) ) ,-5) ,4,6) +transpose((transpose(arpeggio((shuffle((((step(X,12) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +transpose(transpose(X,4) ,12) ) ) +transpose(step(step(transpose(X,-7) ,12) ,12) ,12) ) ) ,4) +transpose(transpose(step(transpose(X,-5) ,12) ,-5) ,-7) ) ,-5) ) ,12) ) ,-7) |step(echo(transpose(transpose((((transpose((transpose(((((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) +transpose(arpeggio((transpose(X,4) +transpose((X+transpose(X,7) ) ,7) ) ) ,12) ) +transpose((transpose(X,-7) +transpose(arpeggio(X) ,7) ) ,12) ) ,-7) +transpose((transpose((transpose(transpose(transpose(arpeggio(transpose(X,-7) ) ,-7) ,-7) ,-5) |shuffle((step(transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,4) ,12) +(X+transpose(X,12) ) ) ) ) ,-5) +transpose(transpose((transpose(((echo(X,4,6) +transpose(transpose(X,-7) ,12) ) |(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,12) ) ) ,-7) +echo(X,4,6) ) ,-7) ,7) ) ,7) ) ,4) +transpose((shuffle(transpose(arpeggio(step((X+transpose(X,12) ) ,12) ) ,4) ) +transpose(arpeggio(echo(echo((((X+transpose(X,12) ) +transpose(transpose(X,-7) ,4) ) +transpose((X|X) ,7) ) ,4,6) ,4,6) ) ,-7) ) ,4) ) +transpose(((((transpose((shuffle((X+transpose(X,7) ) ) +transpose((X+transpose((X+transpose(X,12) ) ,12) ) ,7) ) ,-7) |transpose(transpose(arpeggio(transpose(X,-5) ) ,4) ,-7) ) |(arpeggio((transpose(X,-5) |X) ) +(transpose(arpeggio(transpose(arpeggio(X) ,-5) ) ,-7) +transpose(transpose(transpose(transpose((X|X) ,-7) ,4) ,-5) ,7) ) ) ) +transpose(step(step((((X+transpose(transpose(X,-7) ,4) ) +transpose(step(X,12) ,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,12) ,12) ,12) ) +arpeggio(transpose(arpeggio(shuffle((transpose((transpose(((X|X) +(X+transpose(X,7) ) ) ,-5) +transpose(echo(step((X|X) ,12) ,4,6) ,12) ) ,4) +transpose((arpeggio(arpeggio(arpeggio(X) ) ) |(transpose(transpose(transpose(X,4) ,-7) ,-7) +arpeggio(shuffle(X) ) ) ) ,7) ) ) ) ,-7) ) ) ,7) ) |transpose(((transpose(((transpose((transpose((X|arpeggio(X) ) ,-5) +transpose(transpose(shuffle(transpose(transpose(X,-5) ,-5) ) ,4) ,12) ) ,-7) +transpose(((transpose(((X+transpose(X,7) ) +transpose(shuffle(X) ,7) ) ,4) |(echo((((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,4,6) |step(X,12) ) ) +transpose(((X|X) +transpose((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,12) ) ,4) ) +transpose((((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(transpose((X+transpose(X,12) ) ,4) ,4) ) +transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) +transpose(transpose(transpose((X+transpose(echo(X,4,6) ,7) ) ,-7) ,4) ,7) ) ,7) ) ,4) +transpose(transpose(transpose(transpose(((shuffle(X) +transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(echo((echo(transpose(X,-5) ,4,6) +(transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) ) ,4,6) ,7) ) ,-7) ,-7) ,-7) ,4) ) +transpose(echo(((transpose(echo(transpose(X,-5) ,4,6) ,4) +transpose(((X|(X+transpose(X,12) ) ) +(transpose(X,-7) +X) ) ,12) ) +transpose(step((arpeggio((X|(X+transpose(X,12) ) ) ) +transpose(((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4) ) +transpose(transpose(X,-7) ,7) ) ,12) ) ,12) ,7) ) ,4,6) ,7) ) ,-7) ) ,-7) ,4) ,4,6) ,12) ) random seed used was 147271156
NOTE: Generated phrase was too large ( 10852 ) , it has been truncated at 5000 notes.
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The algorithm for Expresso is written in
KeyKit, and
here's the source code.
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