T. Rex, fronted by Marc Bolan, was a leading figure in the glam rock movement of the early 1970s. The live recording you're referencing appears to align with the period following the band's major breakthrough. Prior to this live performance, T. Rex had released the seminal album "Electric Warrior" in 1971, which featured iconic tracks like "Get It On" and "Jeepster." This album solidified T. Rex's status and was pivotal for glam rock, embracing a mix of catchy melodies and electric vigor. The band's theatrical performances and Bolan's charismatic stage presence greatly contributed to their popularity. Notably, leading up to this period, T. Rex's sound and image were influential, paving the way for future rock acts, and they were known for their energetic live shows that captured the essence of glam rock culture. The live recording would thus embody a critical moment in their trajectory, showcasing T. Rex at the height of their artistic and commercial achievements.