Gladys Knight and the Pips' "I Heard It Through the Grapevine" was at one time the best-selling single in Motown Records history - and then Marvin Gaye's version of the song came along just 13 months later, and knocked it off its pedestal. But Knight's "Grapevine" is no footnote: her rendition of the Norman Whitfield/Barrett Strong classic continues to gain admirers more than half a century after its original release, buoyed by an incendiary 1969 live performance featured in Ahmir "Questlove" Thompson's Oscar-winning documentary Summer of Soul.
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