You searched for: “polyphony
polyphony
1. The simultaneous combination of a number of parts, each forming an individual melody, and harmonizing with each other; the style of composition in which the parts are so combined; polyphonic composition; counterpoint.
2. The symbolization of different vocal sounds by the same letter or character; the fact or quality of being polyphonic.
3. In music, the combination of two or more independent melodies in harmony.