Compose melodies by mimicking evolution by natural selection: There a 3 melodies. Play all 3 and 'click to evolve' on the one you like most. This will create 3 new melodies that differ slightly. Again, click on the one you like most. If you feel like some parts of the melody can't be improved, lock them with the lock buttons above. Save melodies you like. Repeat the process. Evolve a new organism, and then recombine them with the ones you have saved.