The Digital Songs and Billboard 200 charts couldn't look any more different this week.

Sales at the top of the Billboard 200 continue to slide as the No. 1-debuting set-from a rather unlikely band-sold 44,000 copies, according to Nielsen SoundScan. Meanwhile, Britney Spears' "Hold It Against Me" makes a sizzling debut atop the Digital Songs chart with 411,000 sold.

Cake's "Showroom of Compassion" bows atop the Billboard 200 with just 44,000. That's not only the smallest frame for a No. 1 album since SoundScan began tracking sales in 1991 ( beating a record set only last week), but it's also obviously the tiniest figure racked up by a No. 1-debuting album.

Who would have thought that Cake-a band that many may only remember for its 1998 No. 1 Alternative Songs hit "Never There"-would notch not just its first top 10 album in 2011, but also its first No. 1?

Cage the Elephant's new "Thank You Happy Birthday" debuts in the No. 2 slot with 39,000, while last week's No. 1, Taylor Swift's "Speak Now," drops to No. 3 (35,000; down 32%). Country act Steel Magnolia is the third and final bow in the top 10, as its self-titled set starts at No. 7 (28,000). As for the rest of the top 10, Bruno Mars' "Doo-Wops & Hooligans" falls 3-4 (32,000; down 15%), Nicki Minaj's "Pink Friday" slips 2-5 (32,000; down 17%), and the "Country Strong" soundtrack rises 10-6 (29,000; up less than 1%). Rihanna's "Loud" slides 6-8 (28,000; down 16%), Mumford & Sons' "Sigh No More" dips 8-9 (26,000; down 24%), and Kanye West's "My Beautiful Dark Twisted Fantasy" drops 7-10 (25,000; down 24%).

Over on the Digital Songs chart, things brighten up. The arrival of "Hold It Against Me" with an as-expected 411,000 downloads sold in its first week is not just Spears' best sales week for a digital song, but also the largest debut for a woman as a lead artist. It trumps the 325,000 that Swift's "Today Was a Fairytale" sold on the Feb. 6, 2010, chart.

This week, Spears leads two more top 10 bows: Avril Lavigne's "What the Hell" (No. 6 with 163,000) and West and Jay-Z's "H*A*M" (No. 10 with 125,000). The latter reached digital retailers one day later (Jan. 12) than the other two titles.

Last week's Digital Songs No. 1, Mars' "Grenade," falls to No. 2 (219,000; down 21%). Wiz Khalifa's "Black and Yellow" moves 4-3 (190,000; up 3%), Katy Perry's "Firework" slips 2-4 (184,000; down 20%), and Enrique Iglesias' "Tonight (I'm Lovin' You)" slides 3-5 (182,000; down 5%). The Black Eyed Peas' "The Time (Dirty Bit)" falls 5-7 (157,000; down 13%), Lil Wayne's "6 Foot 7 Foot" declines 7-8 (146,000; down 10%), and Ke$ha's "We R Who We R" tumbles 6-9 (141,000; down 19%).

Overall album sales in this past chart week (ending Jan. 16) totaled 4.9 million units, down 11% compared with the sum last week (5.4 million) and down 15% compared with the comparable sales week of 2010 (5.7 million). Year-to-date album sales stand at 10.3 million, an 11% drop compared with the same total at this point last year (11.6 million).

Digital track sales this past week totaled 27.5 million downloads, down 8% compared with last week (29.8 million) and 8% stacked next to the comparable week of 2010 (25.4 million). Year-to-date track sales are at 57.2 million, up 8% compared with the same total at this point last year (52.9 million).

Next week's Billboard 200 competes with the same week in 2010 when: The live charity compilation "Hope for Haiti Now" debuted at No. 1 with 171,000, marking the first digital-only album to reach the top of the chart. The previous week's No. 1, Vampire Weekend's "Contra," fell to No. 6 with 43,000 (down 65%).