Tony Bennett has so many adoring celebrity fans it should come as no surprise that when a major duets album is planned, he's able to draw a roster of the biggest recording stars from the rock and vocal worlds, plus a pair of country music wildcards. (This despite the fact that he recorded an album with several duets in 2001, and a full-album collaboration one year later with k.d. lang.) One surprise is how well producer Phil Ramone paired Bennett with both duet partners and fitting standards -- among them Barbra Streisand on the optimist's anthem "Smile," Dixie Chicks for the flapper standard "Lullaby of Broadway," Bono on the wickedly spiteful "I Wanna Be Around," Tim McGraw on "Cold, Cold Heart" (the Hank Williams song that was Bennett's biggest country crossover hit), Stevie Wonder on his own "For Once in My Life," Juanes for "The Shadow of Your Smile" (which was a hit first for the Brazilian Astrud Gilberto), and Sting on the torch song "Boulevard of Broken Dreams." (Even the title of "How Do You Keep the Music Playing?" seems fit for George Michael to sing.) Each performance was recorded with Bennett and his duet partner live in the studio -- it could be no different for such …