n. In music: A counterpoint added to a given melody or cantus firmus, and usually written above it.n. The art of contriving such a counterpoint, or, in general, of composing part-music. Descant was the first stage in the development of counterpoint; it began about 1100.n. In part-music, the upper part or voice, especially the soprano or air.n. A varied song; a song or tune with various modulations.n. A continued discourse or series of comments upon a subject; a disquisition; comment; remark.In music, to run a division or variety with the voice, on a musical ground in true measure; sing.To make copious and varied comments; discourse; remark again and again in varied phrase; enlarge or dwell on a matter in a variety of remarks or comments about it: usually with on or upon before the subject of remark: as, to descant upon the beauties of a scene, or the shortness of life.