On July 19, 1991, Phish was in the midst of their ascent in the live music scene, characterized by their unique blend of rock, jazz, and improvisational styles. This performance of "I Didn't Know" featured Mimi Fishman and the Giant Country Horns and took place at the Somerville Theatre, showcasing the band's collaboration with special guests, which became a hallmark of their live shows. Leading up to this recording, Phish had released their third studio album, "Lawn Boy," in 1990, which included tracks that were staples of their live repertoire. This period was significant for the band as they were solidifying their fanbase and honing their improvisational skills. The combination of their growing catalog and the dynamic nature of their live performances helped them build a reputation that would lead to a dedicated following and influence on the jam band scene.