The departure in 1975 of the last Americans from Vietnam didn't only end a tragic chapter in the history of the two countries ...

Care to rediscover the biggest hit songs from the '70s? Then click through this gallery.

THE WEEK’S MOST POPULAR SONGS RANKED BY ADULT R&B RADIO AIRPLAY DETECTIONS, AS MEAURED BY MEDIABASE AND PROVIDED BY LUMINATE. STATIONS ARE ELECTRONICALLY MONITORED 24 HOURS A DAY, 7 DAYS A WEEK.