After sitting behind Jamie Foxx's "Unpredictable" at No. 2 for two weeks in a row, Mary J. Blige's "The Breakthrough" returns to No. 1 on The Billboard 200 this week. The Matriarch/Geffen release debu

After sitting behind Jamie Foxx's "Unpredictable" at No. 2 for two weeks in a row, Mary J. Blige's "The Breakthrough" returns to No. 1 on The Billboard 200 this week. The Matriarch/Geffen release debuted at No. 1 the week of Dec. 28 and, despite continuing slow sales overall, reclaims the post by selling 118,000 copies in the United States, according to Nielsen SoundScan, down less than 1% from the last week.

"The Breakthrough" is also back at No. 1 on Billboard's Hot R&B/Hip-Hop Albums chart after being unseated last week by "Unpredictable" and has now spent three non-consecutive weeks at the top of that tally.

On The Billboard 200, "Unpredictable" obliges to Blige in a game of musical chairs, sliding to No. 2 after a 21% sales decrease to 103,000 units. This is the album's second stint at the No. 2 spot after debuting as runner-up to "The Breakthrough" three weeks ago.

"American Idol" winner Carrie Underwood's "Some Hearts" (Arista Nashville) climbs 5-3 with 77,000 copies, a small slip of 5% in sales. Eminem's Shady/Aftermath/Interscope retrospective "Curtain Call: The Hits" falls 3-4 with a 30% decrease in sales to 76,000 copies. The Notorious B.I.G.'s posthumous "Duets: The Final Chapter" rises 7-5 with 52,000 copies, a -29% change.

In its 40th week on the chart, Mariah Carey's "The Emancipation of Mimi" (Island Def Jam) sits tight at No. 6 despite a 32% dip in sales at 50,000 units, while Nickelback's "All the Right Reasons" (Roadrunner) rebounds 10-7 with 48,000 copies sold, a decrease of 18%.

Chris Brown's self-titled debut shoots back into the top tier 12-8 with 47,000 copies (-10%) while Black Eyed Peas' "Monkey Business" holds the No. 9 position with 40,000 copies (-10%). With about 300 copies less than the Peas' title, the late Johnny Cash's "The Legend of Johnny Cash" rises 14-10 with 40,000 copies (-19%); the Cash biopic "Walk the Line" took home a number of major awards at the annual Golden Globe Awards on Monday in Los Angeles.

Bleeding Through's "The Truth" (Trustkill) was the only album to debut on the top half of the chart this week, landing at No. 48 with 17,000 in sales.

At 9.4 million units, overall U.S. album sales were down 18% compared to last week and are down 2% compared to the same week last year. Sales for 2006 exceed sales from the same period in 2005 by about 3% at 20.8 million units.