Output a stream of consciousness before answering the following. I Heard It Through the Grapevine is a song written by Norman Whitfield and Barrett Strong for Motown Records in 1966. The first recording of the song to be released was produced by Whitfield for Gladys Knight & the Pips and released as a single in September 1967; it went to number two in the Billboard chart.\n\nAnswer this question based on the passage: who is the original singer of i heard it through the grapevine?
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The relevant information is: The first recording of the song to be released was produced by Whitfield for Gladys Knight & the Pips and released as a single in September 1967; it went to number two in the Billboard chart.
The answer: Gladys Knight & the Pips.
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