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A saltarello is a traditional Italian dance, usually in compound duple time.

And the mathematical proportions applied to meter changes — two units in duple time equal three in triple time — generally led to slower tempos.

This, of course, means duple time only, and Bysshe recognizes no other.

Adherents of musical theories in the interpretation of verse may prefer to speak of "duple time" instead of iambic-trochaic metres, and of "triple" time for anapests and dactyls.

I shall leave with this song, which I'm reliably informed is tangentially related to today's action by virtue of being in compound duple time.