Speaking of songs not heard in decades:
In the past 40 minutes or so, KPIG has played Joy of Cooking's Brownsville Mockingbird, and just now their "420 Moment" was Jesse Winchester's Twigs and Seeds. I'm sure I hadn't heard either in a good 25 years, if not more (and probably lots more in the case of the JofC, as that song was a hit circa '71 or so).