Music R&B

Which of these R&B groups is made up of two sets of brothers?

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What Grammy Award-winning singer produced two songs on Mario's debut album?
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What was the title of the RZA's first single?
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In the song "Low" by Flo Rida, what lyrics follow "make it rain____"?
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What artist is responsible for the 2000's R&B hits "Me, Myself and I" and "Crazy In Love"?
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What R&B star launched her own record label in 2004, Matriarch Records?
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In Black Eyed Peas' "My Humps", where is "all that junk"?
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Which rapper cameoed in Chris Brown's "New Flame" video?
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Who is featured on Usher's "She Came to Give It to You"?
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