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What is another word for descant?

What's another word for descant? | Here's a list of synonyms for descant.

Definition 1: a decorative musical accompaniment (often improvised) added above a basic melody - [noun denoting communication]

Definition 1: sing by changing register; sing by yodeling - [verb of communication]

Definition 1: talk at great length about something of one's interest - [verb of communication]

Definition 1: sing in descant - [verb of creation]