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The sample of this video is some classical music but it is currently eluding me.
Xzibit - Paparazzi
I suppose you are referring to Gabriel Fauré's Pavane (Opus 50). Commonly used in commercials, samples, covers... a lot.
The specific female vocalise sampled in Paparazzi is from Barbra Streisand's cover.
Required, but never shown