In 1969 at Memorial Auditorium in Dallas I saw Jimi Hendrix and the opening band was a new band called The Chicago Transit Authority who became just Chicago. Sat 3rd row center. Never will forget that show.
In 1970 I saw The Rolling Stones at McFarlin Auditorium in Dallas and they were 1&1/2 hours late and the opening band, Chuck Berry, played for almost 3 hours and killed it. I didn't care whether the Stones showed up or not, he was that good.