'Idol' track sales: Underwood, Clarkson, more

Carrie Underwood has the top-selling track for an American Idol act this week, but Kelly Clarkson's right behind her with Stronger (What Doesn't Kill You). And Kelly's got the track with the big sales bump, as new single Dark Side jumps 63%, according to Nielsen SoundScan.

Carrie Underwood, Good Girl (46,000, -15%, 1.082 million)
Kelly Clarkson, Stronger (What Doesn't Kill You) (44,000, -13%, 3.405...