"American Idol" Winner Gets Instant iTunes Success. How Fleeting Will It Be? (AAPL)

A bonus for American Idol winner David Cook: Dominance of the iTunes Top 10 chart, where he has the top four most-downloaded songs less than 24 hours after his victory.

No surprise right? Shouldn’t an Idol victory always translate into iTunes sales? Not necessarily: Last year winner Jordin Sparks started out in eight place after her victory.

Enjoy it while you can, David: The long-term track record for Idol winners is mixed at best, and male winners have an even harder time than their female counterparts: Ruben Studdard and Taylor Hicks have both been dropped by Sony BMG following their wins.

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