Related Clues:

• Half a 45
• Optimist's focus
• Hit's counterpart
• *It's usually not played much
• 'Revolution,' to 'Hey Jude'
• No-hit performance?
• Part of a 45
• Less-played 45 part
• Improbable hit
• Less popular song on a single, usually
• Back of a hit single
• Less promising of two songs
• It's usually spun first
• Lesser-played half of a 45
• 45's back