Nicholas Christian Hopkins was an English pianist and organist. He performed on many popular and enduring British and American rock music recordings from the 1960s to the 1990s, most notably on songs recorded by the Rolling Stones, the Kinks, the Who, the Beatles, the Steve Miller Band, Jefferson Airplane, Rod Stewart, George Harrison, John Lennon, Paul McCartney, Ringo Starr, The Hollies, Cat Stevens, Carly Simon, Harry Nilsson, Joe Walsh, Peter Frampton, Jerry Garcia, Jeff Beck, Joe Cocker, Art Garfunkel, Badfinger, Graham Parker, Gary Moore, Quicksilver Messenger Service and Donovan. He is widely considered to be one of the greatest studio pianists in the history of popular rock music.

The Hollies are an English rock and pop band formed in 1962. One of the leading British groups of the 1960s and into the mid-1970s, they are known for their distinctive three-part vocal harmony style. Allan Clarke and Graham Nash founded the band as a Merseybeat-type group in Manchester, although some of the band members came from towns further north, in east Lancashire. Nash left the group in 1968 to form Crosby, Stills & Nash, though he has reunited with the Hollies on occasion.