'Idol' track sales: Underwood, Clarkson, etc.

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 million)
Jennifer Lopez feat. Pitbull, Dance Again (29,000, -17%, 821,000)
Phillip Phillips, Home (29,000, -24%, 448,000)
Jennifer Lopez feat. Flo Rida, Goin' In (10,000, debut, 10,000)
Kelly Clarkson, Mr. Know It All (10,000, +1%, 1.524 million)
Kelly Clarkson, Dark Side (9,000, +63%, 55,000)
Carrie Underwood, Blown Away (8,000, -21%, 188,000)
Brad Paisley/Carrie Underwood, Remind Me (7,000, -23%, 1.563 million)
Jason Aldean/Kelly Clarkson, Don't You Wanna Stay (6,000, -5%, 2.093 million)
Carrie Underwood, Before He Cheats (5,000, -4%, 3.494 million)