Historical clue formulations

• "I Am the Walrus" and "Revolution," for two — 2020-06-04
• Sleeper hits, perhaps — 2020-02-27
• Where less-played tunes can be found on old records — 2018-10-29
• Cuts on the back? — 2017-04-16
• Back tracks? — 2016-03-11
• Queen's "We Will Rock You" and others — 2014-10-25
• Backs of hit singles — 2008-11-12
• They're opposite hits — 2008-06-12
• "P.S. I Love You" and "Revolution," e.g. — 2007-06-17
• Lesser hit locations — 2006-02-12
• They usually aren't hits — 2002-02-09