In music, a meloy (from Greek μελῳδία - melōidía, "singing, chanting"), also tune, voice, or line, is a series of linear events or a succession, not a simultaneity as in a chord (see harmony). However, this succession must contain change of some kind and be perceived as a single entity (possibly Gestalt) to be called a melody. Most specifically this includes patterns of changing pitches and durations, while most generally it includes any interacting patterns of changing events or quality. "Melody is said to result where there are interacting patterns of changing events occurring in time."