For drummers, it could be hard, if not impossible, to pick out one standout track from the extensive and legendary career of this month’s cover artist, Steve Gadd. His feel and explosive solo on Steely Dan’s “Aja,” the inventive groove on Paul Simon’s “50 Ways to Leave Your Lover,” and the genre-melding jazz and fusion work he’s done with Chick Corea on tunes such as “Samba Song” and “Nite Sprite” only offer a glimpse into Gadd’s lasting impact on the drumming world.