Plus: Art Garfunkel scores one for the sidekicks.
Plus: "Lean on Me" and the curious case of cover songs hitting number one.
Plus: REO Speedwagon ushers in the weepy white guy ballad era.
Plus: Flo Rida triggers intense middle school flashbacks
Plus, The Beatles pull off an unmatched chart record.
From Janet Jackson and Madonna, to the Rolling Stones and Young MC, you might know more songs on here than you’d think.