Rated R [Explicit Content] (2 Lp's)"Russian Roulette," released weeks prior to Rated R, just hinted at Rihanna's sudden desire to provoke. Even with the realization that it is metaphorical, the song startles with its hesitant gasps, spinning cylinders, and verses that are glacially paced, where a cold piano line and the slight inflections in Rihanna's voice are front and center. And then there's an audible shudder followed by a discharged bullet the abrupt end to one of Rated R's most