Island/IDJ teen phenom Justin Bieber racks up another week at #1 with 89k, the lowest total of the year, but only the second below-six-figure chart-topper of 2010 (Lady Antebellum topped the chart in March with 92k).

Columbia had two debuts in the Top 5, with Grammy Best New Artist nominee MGMT’s Congratulations at #2 and fellow prog-rockers Coheed & Cambria’s Year of the Black Rainbow at #5. In all, Sony Music had six in the Top 10, including LaFace/JLG’s Usher (#3), Kemosabe/RCA/RMG’s Ke$ha (#7), J/RMG’s Monica (#9) and Epic’s Sade (#10).

A pair of EMI Music entries, Capitol Nashville’s Lady Antebellum (#4) and Capitol’s Now 33 (#6), round out the Top 10 with Interscope’s Lady Gaga (#8).

Television had a hand in most of the major upward moves, with Lady Antebellum’s ACM appearance sending it up 15%, Ke$ha’s SNL performance moving the dial 39%, Sade’s Dancing with the Stars spot sending it soaring a chart-best 53% and Atlantic Best New Artist winners Zac Brown Band’s ACM stint achieving a double-digit gain of 23%.

Atco/Rhino’s Jeff Beck album, Emotion & Commotion, is among this week’s chart newcomers, giving the veteran Rock and Roll Hall of Fame guitar god the best debut of his career at #13, with an American Idol appearance featuring Joss Stone on tap for tonight.

Nonesuch’s Natalie Merchant (#16), Atlantic’s American Idol alum Jason Castro (#20), Warner Bros.’ Gucci Mane mixtape Burrrprint (2) HD (#21), Mercury Nashville’s Broadway-turned-country star Laura Bell Bundy, with the first release from UMGD’s Velocity low-price initiative (#28) and Atlantic a cappella group Straight No Chaser (#29) round out the week’s Top 50 debuts.

19/RCA/RMG’s Adam Lambert (#31), along with Columbia’s Glee Vol. 1 (#41) and Vol. 2 (#45), in advance of this week’s release of The Power of Madonna compilation, all re-enter the chart.

The week’s other major gainers include Virgin/EMI Coachella headliners Gorillaz (#27, +28%) and Cash Money/Universal Motown’s Young Money (#39, +22%).

This week’s top releases include Columbia’s AC/DC Iron Man 2 and Glee Madonna soundtracks, as well as Priority/EMI Music’s rap stoner icons Cypress Hill.