At which Los Angeles recording studio did Metallica record most of its 1991 album Metallica?

Metallica recorded most of its 1991 album Metallica at One on One Recording Studios in Los Angeles.

The main recording period ran from October 1990 through June 1991, making the project an unusually extended studio undertaking. The band also worked for about a week at Little Mountain Sound Studios in Vancouver, British Columbia, while additional overdubs and mixing took place at A&M Studios in Hollywood.

One on One was therefore the principal studio associated with the album, even though the production was not confined to a single building. The band worked with producer Bob Rock, who encouraged the members to record more collectively and emphasized a stronger live feel.

The album’s sessions were marked by perfectionism and repeated takes. The final result represented a major change from the more intricate thrash approach of Metallica’s previous records, combining heavy guitar tones with clearer arrangements and more direct song structures.