"R&B" meaning in English

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          "ref": "2004 October 31, Kelefa Sanneh, “The Rap Against Rockism”, in The New York Times:",
          "text": "Rock bands record classic albums, while pop stars create \"guilty pleasure\" singles. It's supposed to be self-evident: U2's entire oeuvre deserves respectful consideration, while a spookily seductive song by an R&B singer named Tweet can only be, in the smug words of a recent VH1 special, \"awesomely bad.\"",
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