Mid 16th century (in an earlier sense). From classical Latin concentus a singing together, a playing together, song, tune, choir, chorus, agreeable combination of sounds, agreement, concord, harmony, in post-classical Latin also used to distinguish the melody of plainchant proper from the accentus of liturgical recitation from concinere to sing together, to sound together, to agree + -tus, suffix forming verbal nouns, perhaps after ancient Greek συμϕωνία, although later considered as equivalent to ancient Greek ἁρμονία.