Related Clues:

• 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'
• Back of a hit record
• Musical flip
• The Beatles' 'P.S. I Love You,' e.g
• Bachelor party - most singles had one
• Pop single's second song
• Single's less good song
• Less important part of a music single
• Madonna's 'Into the Groove,' originally
• Record following?