To perform (sing, play, etc.) as a duet.
(of two people) To say at the same time, to chorus.
To perform a duet.
To communicate (warnings, mating calls, etc.) through song.
A musical composition in two parts, each performed by a single voice (singer, instrument or univoce ensemble).
A song composed for and/or performed by a duo.
A pair or couple, especially one that is harmonious or elegant.
To play or sing in harmony.
To bring things into harmony, or to make things compatible.
To provide parts to.
To provide the harmony for a melody.
To be in harmonious agreement.