American singer and Rock and Roll pioneer Chubby Checker claps his hands and sings as he performs on Ed Sullivan's CBS variety show, 'Toast of the Town,' New York, October 22, 1961. (Photo by CBS Photo Archive/Getty Images)
The Beatles rehearse at the ABC Theatre, Blackpool for the group's bill-topping appearance on ABC TV's Blackpool Night Out, 1 August 1965. Left to right: George Harrison, Paul McCartney, John Lennon, and Ringo Starr. (Photo by Daily Mirror/Daily Mirror/Mirrorpix via Getty Images)
The Beatles answer questions for newsmen and journalists in New York after their arrival for their first tour of America. Left to right: Paul McCartney, Ringo Starr, George Harrison and John Lennon. 7th February 1964. (Photo by Daily Mirror/Daily Mirror/Mirrorpix via Getty Images)
American folk rock group The Mamas and the Papas, 15th June 1966. From left to right, they are record producer Terry Melcher, band members John Phillips, Cass Elliot and Denny Doherty, and record producer Lou Adler. (Photo by Watson/Express/Hulton Archive/Getty Images)
Close-up of American musician Bob Dylan as he plays acoustic guitar during a performance at the Newport Folk Festival, Newport, Rhode Island, July 1963. (Photo by Rowland Scherman/Getty Images)
