Jack Johnson’s To the Sea holds the top spot on the digital-albums chart. By Gil Kaufman Train’s Patrick Monahan Photo: C. Flanigan/ FilmMagic The weekly iTunes albums and singles chart aren’t always identical to the Billboard tallies, because downloading habits are sometimes way different from what people are picking up on the trip to the local Wal-Mart. And while much of this week’s iTunes top 10 mirrors the action on the Billboard side, there are a few notable highlights that show where mainstream tastes diverge from Web ones. Let’s take the iTunes singles chart first. It is currently topped by mellow rockers Train with their comeback hit “Hey, Soul Sister,” which is a few slots further down on the Billboard side. iTunes doesn’t release specific sales figures, but suffice it to say it was another solid week for up-and-coming MC B.o.B, whose collabo with Bruno Mars, “Nothin’ on You,” is at #2 on the singles chart, followed by Rihanna (“Rude Boy”), Taio Cruz and Ludacris (“Break Your Heart”), Jason Der
