The music was recorded inside Toronto's Church of the Holy Trinity on November 27, 1987 (1987-11-27), with the band circled around a single microphone.

The album includes a mixture of original material by the band and covers of classic folk, rock and country songs.

According to the band's website,[13] the direction of The Trinity Session was influenced by music they had heard while touring the southern United States in support of their debut studio album Whites Off Earth Now!!

To better persuade the officials of the historic church, the band claimed to be the Timmins Family Singers and said they were recording a Christmas special for radio.

To better balance Margo Timmins' vocals against the electric guitars and drums, she was recorded through a PA system that had been left behind by a previous group.

By making subtle changes in volume and placement relative to the microphone over six hours, Moore and the band had finally reached the distinctive sound of the album by the time the last of the guest musicians arrived at the church.

The band followed this recording with a three-day session in April 1989 at a Quaker meeting house, but decided against releasing those songs until 2022, when they put out Sharon – The Lost Album.