Home : Tune Toys : Expresso
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.

Transformations:
 Seed: Randomize seed: Generations: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Phrase for X: Basic 1 - c,e,gBasic 2 - c,g,e,b-Basic 3 - c,gBasic 4 - cBasic 5 - co3,co4,co3,co2Chord 1 - c e gChord 2 - c e- gChord 3 - c e- g b-Chord 4 - c f gFile 1 - bachinv1.midFile 2 - bachinv2.midFile 3 - bachinv3.midFile 4 - bachinv4.midFile 5 - bachinv5.midFile 6 - bachinv6.midFile 7 - bachinv7.midFile 8 - bachinv8.mid # of Tracks: 1234 Randomize patches: noyes Results may not appear for a few seconds.Be patient!
 Do you like this result? Do you want to let other people listen to it? Save this one in theTune Trove! See what's alreadyin the Tune Trove!

 After 18 generations the expression "X" became this: shuffle(((transpose(echo(shuffle(((transpose((X+transpose((X|X) ,7) ) ,4) +transpose(arpeggio(step((X|X) ,12) ) ,4) ) |(arpeggio(X) |step(((shuffle((X+transpose(X,12) ) ) +transpose((X+transpose(echo(X,4,6) ,12) ) ,4) ) +transpose((X|X) ,7) ) ,12) ) ) ) ,4,6) ,-5) +transpose(transpose(((step((((((echo(((X+X) |shuffle(arpeggio(X) ) ) ,4,6) +transpose((transpose((transpose(X,4) +transpose(transpose(transpose(X,-5) ,-7) ,12) ) ,4) +((step(transpose(X,-7) ,12) |(transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ) +transpose(step(X,12) ,12) ) ) ,12) ) +transpose(((((shuffle(transpose(((transpose(X,-7) |shuffle(X) ) +transpose(((X+transpose(X,12) ) |transpose(X,-7) ) ,12) ) ,-5) ) +transpose((((((transpose(X,-7) +transpose(step(X,12) ,4) ) +transpose(X,7) ) |transpose(X,-5) ) +transpose(shuffle((((X+X) +transpose(X,4) ) +transpose(step(X,12) ,7) ) ) ,12) ) |((arpeggio((((X|X) +transpose(transpose(X,4) ,4) ) +transpose(arpeggio(X) ,7) ) ) |(transpose(echo(echo(X,4,6) ,4,6) ,4) +X) ) |(((X+X) +((X+transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-5) ,7) ) ) +((transpose(X,-5) |(X+transpose(X,7) ) ) |transpose(echo(X,4,6) ,4) ) ) ) ) ,12) ) +transpose(transpose((transpose(X,4) +echo(((transpose(X,4) +transpose(X,12) ) +transpose(transpose(transpose(X,4) ,-5) ,12) ) ,4,6) ) ,-7) ,7) ) +transpose(transpose(step(echo(transpose(echo(transpose((transpose(X,-7) +transpose(transpose(X,4) ,12) ) ,-5) ,4,6) ,-7) ,4,6) ,12) ,-5) ,4) ) +transpose(shuffle((echo(step((X+shuffle(shuffle(X) ) ) ,12) ,4,6) |(transpose(step(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,12) ,-7) +(((X+transpose((X|X) ,4) ) +transpose((X+X) ,7) ) +transpose(echo(X,4,6) ,7) ) ) ) ) ,7) ) ,4) ) +transpose(arpeggio(((transpose(echo((transpose(X,4) |transpose(arpeggio(X) ,-7) ) ,4,6) ,-7) |echo(transpose((((X+transpose(X,7) ) +transpose((X+transpose(X,12) ) ,7) ) +transpose(transpose(shuffle((X|X) ) ,-7) ,12) ) ,-7) ,4,6) ) +transpose(transpose((transpose(transpose(X,4) ,-7) +transpose(transpose(step(X,12) ,-7) ,12) ) ,-7) ,7) ) ) ,7) ) +transpose(transpose(transpose(transpose((transpose(((X+transpose((X+X) ,-5) ) +transpose((X+transpose((transpose(X,-5) +(X+X) ) ,12) ) ,-5) ) ,-5) +transpose((transpose(echo(transpose(transpose((X|X) ,4) ,-5) ,4,6) ,-7) |transpose((transpose(echo((X+transpose(X,7) ) ,4,6) ,-5) |transpose(transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ,-7) ) ,-5) ) ,7) ) ,-5) ,4) ,-7) ,4) ) +transpose(transpose(transpose(transpose(((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ,-7) ,-7) ,7) ) ,12) +transpose(transpose((transpose((((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) |step(X,12) ) +(X|(transpose(X,-5) +transpose((X+X) ,7) ) ) ) ,4) ) +transpose((arpeggio((X+transpose(X,12) ) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-5) ) ,7) ) ,4) +transpose(transpose(transpose((transpose((X+X) ,4) +transpose(X,4) ) ,-5) ,-5) ,4) ) +transpose((((transpose(X,4) +transpose(X,4) ) +transpose((echo(X,4,6) +transpose(X,12) ) ,7) ) |(transpose(X,4) +transpose((X+X) ,7) ) ) ,7) ) +transpose(((step(shuffle(transpose((((X|X) +transpose(X,4) ) +transpose((X+X) ,7) ) ,4) ) ,12) +(arpeggio(transpose(X,-5) ) |transpose(X,4) ) ) |transpose(step(((X+transpose(X,12) ) +transpose(X,4) ) ,12) ,4) ) ,12) ) ,-7) +transpose(((transpose((X+X) ,4) +transpose(transpose((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) ,-7) +transpose((echo((X+transpose(X,7) ) ,4,6) +arpeggio(X) ) ,4) ) ,-5) ,4) ) +transpose(transpose(transpose(transpose(X,-5) ,-7) ,-5) ,7) ) ,7) ) ,-5) ,4) ) +transpose((((echo((transpose(step(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) +echo(transpose(X,4) ,4,6) ) ,12) ,-5) |(((((X|X) |X) +transpose(transpose(transpose(X,-5) ,-7) ,-7) ) +transpose(echo(shuffle((X+transpose(X,12) ) ) ,4,6) ,4) ) +transpose(((transpose(X,4) |(X+transpose(X,7) ) ) |(X+(X|X) ) ) ,7) ) ) ,4,6) +transpose((transpose((transpose(shuffle(transpose((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ) ,-7) |((((X+transpose(X,7) ) +transpose(shuffle(arpeggio(X) ) ,12) ) +transpose(step((step(X,12) |transpose(X,-5) ) ,12) ,4) ) +transpose(transpose((((X|X) +transpose((X|X) ,4) ) +transpose((X|X) ,7) ) ,-5) ,7) ) ) ,-5) +transpose(transpose(transpose(transpose(echo((X|X) ,4,6) ,-7) ,-7) ,-7) ,12) ) ,4) ) +transpose(((arpeggio(arpeggio((transpose((X|X) ,-5) +transpose((arpeggio(X) +transpose(transpose(transpose(X,-7) ,4) ,12) ) ,7) ) ) ) +transpose(step(transpose(transpose((X+transpose(X,-5) ) ,-7) ,-7) ,12) ,-5) ) |transpose((((((X+transpose(X,4) ) +transpose(X,7) ) +((X|X) +transpose(X,-5) ) ) +transpose(transpose(arpeggio(((X+transpose((X+transpose(X,12) ) ,12) ) |(((X+transpose(X,7) ) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) ,-5) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,7) ) ,4) ) ,7) ) +transpose(transpose(transpose((echo(((arpeggio(transpose((X+X) ,-5) ) |(step((X|X) ,12) |((X+transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) ) +transpose(echo((X+X) ,4,6) ,7) ) ,4,6) +transpose(((echo(echo((shuffle((X+transpose(X,-7) ) ) +((X+transpose(shuffle(X) ,7) ) +(((X+X) +transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ,4,6) |((echo(echo((transpose(X,-5) |(X+transpose((X+transpose(X,12) ) ,12) ) ) ,4,6) ,4,6) +transpose((shuffle((X+transpose(X,12) ) ) +transpose((transpose(transpose(X,4) ,4) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) ,12) ) ,4) ) +transpose(transpose(transpose(transpose(X,4) ,-5) ,4) ,7) ) ) +transpose(step(step(shuffle(((X+transpose(X,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ,12) ,-5) ) ,12) ) ,-5) ,-7) ,12) ) ,7) ) ,-5) ,4) ) +transpose((((transpose((arpeggio(X) +(transpose(transpose(transpose(step(X,12) ,4) ,4) ,-5) |((shuffle(X) |step((X+X) ,12) ) +transpose(transpose(step(transpose(X,-5) ,12) ,-5) ,12) ) ) ) ,4) +transpose(transpose(echo(step(transpose(transpose((X|transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,4) ,4) ,12) ,4,6) ,-5) ,7) ) +transpose((transpose(transpose(((((step(X,12) |(transpose(X,-5) +transpose((X+transpose(X,7) ) ,12) ) ) +transpose(shuffle(arpeggio(X) ) ,4) ) +transpose((X+X) ,7) ) |transpose((X|X) ,-5) ) ,4) ,-5) +transpose(((transpose(transpose(transpose(echo(transpose(step(X,12) ,-7) ,4,6) ,4) ,4) ,-5) +transpose((((transpose(X,-5) |(transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose((transpose(echo(X,4,6) ,-7) |(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) |X) ) ,7) ) |transpose(echo(transpose(transpose(X,-5) ,-7) ,4,6) ,-7) ) ,12) ) +transpose(step(arpeggio(arpeggio(step(((((X+transpose(X,4) ) +transpose(X,7) ) |(X+X) ) |X) ,12) ) ) ,12) ,12) ) ,12) ) ,7) ) |echo(transpose((transpose(transpose((transpose(transpose(X,4) ,-5) +transpose((((X+transpose(X,7) ) +transpose(transpose((transpose(X,4) +transpose(transpose(X,-7) ,7) ) ,4) ,12) ) +transpose(((step(X,12) +transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose(X,7) ) ,12) ) ,12) ) ,-7) ,-5) +transpose((transpose((transpose(transpose(transpose(X,-5) ,-7) ,-7) |echo(transpose(transpose((X+transpose(X,7) ) ,4) ,-5) ,4,6) ) ,-7) +transpose((((echo(X,4,6) +transpose((transpose(X,-7) +transpose(step(echo(transpose(X,4) ,4,6) ,12) ,12) ) ,7) ) |transpose((X+step(X,12) ) ,-5) ) |(transpose(transpose(X,-5) ,-5) |(transpose(X,-7) +transpose((X+transpose(X,12) ) ,12) ) ) ) ,12) ) ,7) ) ,-5) ,4,6) ) ,7) ) ) random seed used was 140255569

The algorithm for Expresso is written in KeyKit, and here's the source code.