In June 1983, U2 performed "Gloria" live at the Red Rocks Amphitheatre, a pivotal moment in their early career. This performance came shortly after the release of their second studio album, "October," which was released in October 1981. "Gloria," the album's second single, showcases the band's evolving sound and their exploration of spiritual themes, which became a signature aspect of their music. The live recording at Red Rocks is particularly noteworthy not only for the breathtaking natural setting but also for its role in solidifying U2's reputation as a dynamic live act. The headlining performance was a breakthrough, capturing the band's energy and passion, and it was subsequently released as part of the "Under a Blood Red Sky" live EP in 1983, marking a key moment in U2's ascent to global stardom. This concert is often remembered for its atmospheric visuals and the band's connection with the audience, setting the stage for their future successes.