Historical clue formulations

• 1959 hit with the lyric "One day I feel so happy, next day I feel so sad" — 2014-05-16
• 1959 #5 hit with the B-side "I've Cried Before" — 2013-09-20
• 1959 doo-wop classic — 2012-12-29
• Dion and the Belmonts' first Top 10 hit — 2005-05-20
• 1959 pop hit that asked "Why?" — 2004-07-23
• 1959 Dion and the Belmonts hit — 2000-12-01