Jim Keltner didn't become one of America's most beloved drummers by playing flashy licks or over-the-top solos. The unhurried gravitas of the beat on Bob Dylan's "Knockin' On Heaven's Door," the funky, in-the-pocket groove of Steely Dan's "Josie," the spare but dramatic framework of John Lennon's "Jealous Guy"—they're all hallmarks of a drummer who regularly pulls rabbits from his hat and makes it look deceptively simple.