The unexpected tempo for a hip-hop track, the mellow vibe, the tribal drums and percussion, Rihanna's lower register, their combined star power and the fact that this is the title track to one of the biggest albums of the year. >>>>>>
That would be Gil Scott-Heron's voice. He covered "I'll Take Care Of You" from Bobby Bland last year, which provides the hook: http://www.youtube.com/watch?v=PXPN2dbgu5g
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