R&B rules the music world this week as the genre claims the top five spots on the new SoundScan album sales report.Posting her seventh week at the top, Mariah Carey sees her latest Columbia title, “Music Box,” jump from No. 2 to No. 1 on sales of nearly 117,000, up 19, 000 from the previous report. SoundScan figures were supplied by an industry source. Carey currently has two singles in the top 10, including her remake of “Without You,” made famous by the late Harry Nilsson. Following Carey is soulful singer Tony Braxton’s self-titled debut for Laface/Arista, last week’s No. 1; smooth hip-hopper R. Kelly’s Jive entry “12 -Play”; femme rappers Salt-n-Pepa, at No. 4, with the Next Plateau-issued “Very Necessary”; and rapper Snoop Doggy Dogg, with his triple-platinum “Doggystyle” (Death Row/Interscope). The highest new entry of the week belongs to acclaimed Canadian singer/songwriter Sarah McLachlan, whose sophomore Arista effort, “Fumbling Towards Ecstasy,” bows at No. 109, on sales of 11,000. The only other notable debut for the period was “Crooked Rain, Crooked Rain,” the critically applauded third album from Northern California alternative band Pavement, at No. 121. Showing strong second-week sales is the soundtrack from Ben Stiller’s new romantic comedy, “Reality Bites,” which soars from No. 189 to No. 57 on sales of 19,000, up more than threefold from its first week.