In a week with seven top 20 debuts, Nickelback's "Dark Horse" (Roadrunner) sold 326,000 to start at No. 2. The Canadian rock outfit spent an astonishing 156 weeks on the chart with its prior album, 2005's "All the Right Reasons," which is at 6.97 million to date.

Reigning "American Idol" champion David Cook's self-titled 19 Recordings/RCA debut arrives at No. 3 with 280,000.
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