At which Los Angeles studio were most recording sessions for Metallica’s 1991 album held?

Most recording sessions for Metallica’s 1991 album were held at One on One Recording Studios in Los Angeles.

Metallica began recording there in October 1990, working with producer Bob Rock during an extended eight-month production period. 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 additional locations are why the album’s studio credits list more than one facility.

One on One was therefore the principal recording location, not the only studio connected with the album. The sessions were notable because Rock encouraged the musicians to record more like a unified band rather than assembling every part separately.

The resulting record sounded more direct and polished than Metallica’s earlier albums. Its production also brought the bass guitar forward in the mix, a notable contrast with the famously restrained bass presence on ...And Justice for All.