The term for several voices or instruments singing or playing the same melody, adding richness to a monophonic texture is Polyphony.
Monophony is a musical style in which there is only one melodic line that is played alone. It is a fundamental component of almost all musical civilizations. The earliest recorded examples of monophonic repertory are Byzantine and Gregorian chants, the music of the mediaeval Eastern and Western churches, respectively.
The term "polyphony" describes the most notes that a keyboard or sound module can emit at once. For instance, a keyboard with at least 4-note polyphony would be required if you wanted to play a 3-note chord with a 1-note melody.
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