Noun
a decorative musical accompaniment (often improvised) added above a basic melody

Verb
talk at great length about something of one''s interest

Verb
sing by changing register; sing by yodeling; "The Austrians were yodeling in the mountains"

Verb
sing in descant

v. i.
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.

v. i.
The upper voice in part music.

v. i.
The canto, cantus, or soprano voice; the treble.

v. i.
A discourse formed on its theme, like variations on a musical air; a comment or comments.

v. i.
To sing a variation or accomplishment.

v. i.
To comment freely; to discourse with fullness and particularity; to discourse at large.

Descant

Twenty doctors expound one text twenty ways, as children make descant upon plain song.

She [the nightingale] all night long her amorous descant sung.

Upon that simplest of themes how magnificent a descant!

Descant

A virtuous man should be pleased to find people descanting on his actions.

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.

To sing a variation or accomplishment.