Back to Basics has Christina Aguilera back on top. Sales of the double LP put the singer at #1 on Billboard's albums chart for the second time in her seven-year career.

Nearly 342,000 copies of the disc were scanned its opening week, outselling the debut of her previous effort, 2002's Stripped, according to the latest SoundScan data. Stripped failed to open on top, taking second place with more than 330,000 scans. Aguilera's self-titled 1999 debut did bow at #1 after moving 253,000 units.

Christina's climb to Billboard's apex was barely challenged by Lyfe Jennings, who sits in the chart's #2 slot with his sophomore offering, The Phoenix. With first-week sales reported at 136,000, the R&B crooner's latest failed to pose a serious threat to Aguilera's dominant release. And country star Trace Adkins didn't stand a fighting chance against the "Dirrty" girl. His new LP, Dangerous Man, sold 115,000 copies to claim the chart's #3 spot.

The Billboard albums chart's top five is packed with nothing but new releases, with Atlanta R&B quartet Cherish taking #4 after selling 91,000 copies of Unappreciated its first week out. The soundtrack to the Disney Channel movie "Cheetah Girls 2" opens at #5 with more than 87,000 sales.

The 22nd installment in the Now That's What I Called Music! compilation series slips three spots to #6, selling 83,000 copies its sixth week in stores. The previous chart champ, Rick Ross' Port of Miami, slides to #7 with 79,000 scans.

Eminem protégé Obie Trice is back with Second Round's on Me, which racked up close to 74,000 in first-week sales to debut at #8. The "Step Up" soundtrack steps three spots back to #9, selling 64,000 copies. Rounding out the top 10 is Nickelback's All the Right Reasons, which holds the #10 spot for a third week and moved another 53,000 units to reach a 46-week sales total of more than 3.3 million copies.

In addition to the six newcomers who cracked this week's top 10, seven other new releases sneaked onto the Billboard chart. The soundtrack to America's #1 film, "Snakes on a Plane," comes in at #43. With tracks from Cobra Starship, Panic! at the Disco, the All-American Rejects, Fall Out Boy and Coheed and Cambria, the disc generated close to 19,000 in retail interest. Dancehall specialist Cham's Ghetto Story follows at #53, selling 15,000-plus units, while the inaugural release from Dave Navarro's the Panic Channel, (ONe), opens at #108 with more than 8,000 sales.

The incomparable Yanni returns to the chart at #124, selling 7,000 copies of his Live: The Concert Event. Arizona-bred punks Change of Pace bow at #155 with Prepare the Masses, which sold just over 5,000 units its first week in stores. And coming in at #180 with 4,000 copies sold is Gargolas Next Generation, a Latin reggaetón compilation featuring Tego Calderón, Mario VI and Valentino.

Check out "Christina Aguilera's Old Soul" for an inside look at Back to Basics.