Today, the Zip Code turns 50. Betcha thought it was around forever didn’t ya? Well, as it turns out, it was actually a tough sell to the American public. “People were concerned they were being turned into numbers,” Jennifer Lynch, a U.S. Postal Service historian, told Time Magazine. “They thought it was depersonalizing them.” So how’d the U.S. Postal Service turn a corner and convince a skeptical public to use zip codes? Simple! Folk music—in the form of The Swingin’ Six, shown above in this monster 15-minute clip. (To ensure they got everyone, they also used a cartoon mascot, Mr. Zip.) This is what “A Mighty Wind” was about, right?