What was the first studio where Metallica recorded its 1991 album, known as The Black Album?

Metallica first recorded its 1991 album, known as The Black Album, at One on One Recording Studios in Los Angeles.

The main recording sessions began in October 1990 at the North Hollywood facility, which is often shortened in references to One on One. The band also spent about a week at Little Mountain Sound Studios in Vancouver, British Columbia.

Final overdubs and mixing took place at A&M Studios in Hollywood during June and July 1991. These multiple locations are why answers such as A&M Studios can seem plausible, but A&M was used later in the process rather than being the first recording site.

The sessions lasted roughly eight months and were marked by disagreements between the band and producer Bob Rock. The musicians were accustomed to constructing parts separately, while Rock encouraged them to perform more collaboratively and capture a stronger live feel.