By Jefferson Graham, USATODAY LOS ANGELES - Longtime Rolling Stones keyboardist Chuck Leavell, musical director for the band's 50 & Counting tour, is in charge of forming the set list with lead singer Mick Jagger. He tours with an Excel database of more than 450 Stones songs, and some gear to keep him amused, as we learned during a recent interview. The Stones play Thursday in Toronto....