Paul Shaffer breaks down two of his favorite performances from 'The Late Show with David Letterman' — from John Mayer sitting in to perform Don McLean's "American Pie" to 'Late Show' bassist Will Lee nailing the vocals on Jimmy Webb's "MacArthur Park."⁣ ⁣ ⁣ ⁣ #iHeartRadio | Q104.3 FM

Paul Shaffer is a multi-talented musician who has worked with nearly every musical genius around. Everyone from James Brown, to Miles Davis and Carole King. But you probably know him best as everyone's favorite sidekick, where for 33 years the legendary bandleader served as David Letterman's musical director. In this clip, Shaffer shares with me his most memorable moment during his time on the “Late Show with David Letterman”. You can catch the rest of my interview with Paul Shaffer when it airs