SOUND CITY [RCA] Dave Grohl’s directorial debut centers on the titular studio—the defunct Southern California facility where Nirvana cut Nevermind and countless other artists did some of their finest work—but that’s not really what this film is about. On a micro level, it’s about “the Neve,” an analog recording console purchased by Sound City’s owners in 1973 for the then-princely sum of $75,000. If Grohl and his buddies—an impressive...