'Idol' track sales: Adam Lambert, Daughtry

Adam Lambert's If I Had You, the best-selling track from an American Idol alumnus this week, is approaching a sales milestone, according to Nielsen SoundScan. Though sales of Adam's latest single were off five percent last week, If I Had You should pass the half-million downloads mark easily this week.

The version of Photograph with Chris Daughtry singing was the best-selling individual track off Santana's Guitar Heaven: The Greatest Guitar Classics of All Time. Also making SoundScan's Top Digital Tracks chart from that album: a cover of The Beatles' While My Guitar Gently Weeps featuring India.Arie and Yo-Yo Ma. Also, sales of Daughtry's September jumped 28%.

Adam Lambert, If I Had You (34,000, -5%, 482,000 total)
Daughtry, September (23,000, +28%, 203,000)
Carrie Underwood, Undo It (11,000, -15%, 836,000)
Santana feat. Chris Daughtry, Photograph (9,000, debut, 9,000)
Adam Lambert, Whataya Want From Me (8,000, -17%, 1.54 million)
Carrie Underwood, Mama's Song (6,000, +86%, 84,000)
Carrie Underwood, Cowboy Casanova (4,000, -12%, 1.488 million)
Carrie Underwood, Before He Cheats (3,000, -9%, 3.082 million)
Carrie Underwood, Temporary Home (3,000, -5%, 586,000)