Definitions for "Descant"
Originally, a double song; a melody or counterpoint sung above the plain song of the tenor; a variation of an air; a variation by ornament of the main subject or plain song.
The upper voice in part music.
The canto, cantus, or soprano voice; the treble.
A discourse formed on its theme, like variations on a musical air; a comment or comments.
To comment freely; to discourse with fullness and particularity; to discourse at large.
talk at great length about something of one's interest