Possible Clues:

• 1959 doo-wop classic
• Dion and the Belmonts' first Top 10 hit
• 1959 hit with the lyric 'One day I feel so happy, next day I feel so sad'
• 1959 #5 hit with the B-side 'I've Cried Before'
• 1959 pop hit that asked 'Why?'