In 1968...Pink Floyd released A Saucerful of Secrets. The band celebrated by performing a free show in London's Hyde Park with Jethro Tull, Roy Harper, and T. Rex.
LONDON - JULY 02: (L to R) David Gilmour, Roger Waters, Nick Mason and Rick Wright from the band Pink Floyd on stage at "Live 8 London" in Hyde Park on July 2, 2005 in London, England. The free concert is one of ten simultaneous international gigs including Philadelphia, Berlin, Rome, Paris, Barrie, Tokyo, Cornwall, Moscow and Johannesburg. The concerts precede the G8 summit (July 6-8) to raising awareness for MAKEpovertyHISTORY. (Photo by MJ Kim/Getty Images)