Mick Jagger begins writing from the working-class hero's perspective--especially on the anthem "Street Fighting Man" and "Salt of the Earth"--and Keith Richards buttresses his partner with rock-solid slide licks recently graduated from the School of Old Blues Records. "Jig-Saw Puzzle," which inexplicably never became a hit, is the only known instance of Jagger's describing the Stones' individual personalities in verse. --Steve Knopper