(1) Music which simultaneously has more than one independent melodic line.
(2) Capable of producing more than one note at a time. On most electronic organs, all of the notes can be sounded polyphonically at once, but all synthesizers place a limit on how many voices of polyphony are available. General MIDI-compliant synthesizers are required to provide 24 voices of polyphony. C. Compare with multitimbral.