Wikipedia: “Sound City Studios was located in the San Fernando Valley, amidst rows of dilapidated warehouses. The little-known recording studio housed a unique analog Neve recording console and had a reputation for recording drums. Artists such as Nirvana, Kyuss, Red Hot Chili Peppers, Fleetwood Mac, Neil Young, Rick Springfield, Tom Petty, Rage Against The Machine, and Slipknot recorded groundbreaking music at the studio. The film tells the story of the studio from its early days in 1969 until its closing in 2011.”

Watched this a year or two back but if I mentioned it here I can find no reference. Wonderful documentary about backup singers.