By June 23, 1974, when the Grateful Dead performed at the Jai-Alai Fronton in Miami, they were in a significant phase of their career, having recently released their acclaimed album "From the Mars Hotel" in April 1974. This album was noteworthy as it featured tightly constructed songs alongside extended improvisational jams, reflecting the band’s evolving sound. At this concert, they debuted "Seastones," an experimental piece by band member Phil Lesh, showcasing their willingness to explore avant-garde musical forms. Additionally, the performance included their only rendition of Chuck Berry's "Let It Rock," indicating their fondness for rock and roll roots. The 1974 era marked a peak in their live improvisational prowess and solidified their reputation as pioneers of the jam band movement.