Related Clues:

• Back of a 45 record
• 45 selection
• 'Revolution' or 'P.S. I Love You'
• Less popular half of a record
• Gloria Gaynor's 'I Will Survive,' originally
• 7' flip
• A sleeper hit may be on it
• Back of a record
• "P.S. I Love You," originally
• Many an Everly Brothers hit
• Elvis' ''Hound Dog,'' for one
• Unlikely hit on a 45
• The Righteous Brothers' 'Unchained Melody,' originally
• 'I Am the Walrus,' for the Beatles' 'Hello, Goodbye'
• Queen's 'We Will Rock You,' to 'We Are the Champions'