Foo Fighters frontman and former Nirvana drummer Dave Grohl directs this documentary about Los Angeles' Sound City Studios which specialised in analog recording. Following the closure of the studio in 2011, due to the growing demand for digital recording, Grohl assembled a number of artists, including Josh Homme, Trent Reznor, Paul McCartney and Stevie Nicks, to give interviews and performances while contributing to the creation of a new album.