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KD
Since: May, 2009
2024-08-29 20:36:17
It sounds like you might be describing a cumulative harmony that has a staggered entry/entrance. It's a form of harmonizing
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There is an article for musical Harmony, but that's probably as close as you'll get here.

What’s the trope where someone sings, for example, “Laaaaaa”, then someone else sings “Laaaaaa”, then a third person sings “Laaaaaaaaa”, then a fourth person sings “Laaaaaaaaaaaaaaaa”?