Did interviews for hospital broadcasts of the Beatles, the Who, the Kinks, the Kalin Twins, and many more including Mott the Hoople after a concert in Bristol had thought it was the Hippodrome but think you were right was Colston Hall.
Easy. The Beatles no question! Their music was so unique at the time and still is. It's not very often you see kids of today listening to music which is nearly 50 years old.