Fifty-six years ago today, the Jackson 5's classic song "I Want You Back" reached the No. 1 spot on the Billboard Hot 100.

After a game in 2005, just moments after David Ortiz hit one of his patented majestic walk-off home runs, Red Sox owner John Henry presented his big slugger with a plaque declaring him the “Greatest ...

To really understand the 1960s, you kinda had to be there. But these songs that define the era are still here for everyone to enjoy — and boy have they aged beautifully.