Which Los Angeles recording studio did Metallica use for most of The Black Album’s recording sessions?

Metallica used One on One Recording Studios in Los Angeles for most of The Black Album’s recording sessions.

The band began recording there in October 1990. The album’s listed studio is One on One in Los Angeles, where the core sessions took place during an extended and demanding production period.

Additional work also occurred elsewhere. Metallica spent about a week at Little Mountain Sound Studios in Vancouver, British Columbia, and later completed overdubs and mixing at A&M Studios in Hollywood. These additional locations can cause confusion when the album’s recording history is summarized.

The sessions lasted roughly eight months, ending in June 1991. Producer Bob Rock encouraged the musicians to record more collaboratively and to capture a stronger live-band feel. The process involved repeated takes, disagreements, and detailed editing before the final record was completed.