At which Los Angeles studio did Metallica primarily record Metallica, also known as The Black Album?

Metallica primarily recorded Metallica, also known as The Black Album, at One on One Recording Studios in Los Angeles.

The main recording period ran from October 6, 1990, to June 16, 1991. The band also spent about a week at Little Mountain Sound Studios in Vancouver, while additional overdubs and mixing took place at A&M Studios in Hollywood.

One on One was therefore the album's principal recording location, not its only studio. This distinction matters because album credits often list several locations involved in recording, overdubbing, mixing, and mastering.

The sessions were produced by Bob Rock and represented a new working method for Metallica. Rock encouraged the members to play more collaboratively in the studio, seeking a live-band feel rather than constructing every instrumental part in isolation.