To give an example of how enormously popular Pink Floyd is, there "Dark Side of the Moon" cd stayed on the Billboard charts for an unbelievable 14 years!!!
There is nothing that even comes close to that record.
In 1976 they played Ivor Wynn stadium where they debued "Wish You Were Here". There was approx. 100,000 people on this hot swealtering day from Canada, NY, Il, Mi, Pa etc. I remember the local beer store being sold out by early afternoon and the local kids having a blast collecting all the empty bottles and returning them for cash.
Concert was about 3.5 hours long starting with the soon to be released WYWH album, then a break, (now it's dark out) and then an entire set playing DSOM in which they blew up a million dollar score board by accident when the plane crashed into the stage*, then another break and a return to finish the show with Meddle.
Unquestionably the best concert of my life.
*they cancelled all concert at Ivor Wynn for about 15 years after that show, until Rush played there in the late 80's or early 90's.