1956 – No. 1 Chart Toppers Pop Hit: “(We’re Gonna) Rock Around the Clock,” Bill Haley & His Comets. The song is the opening theme for the film “The Blackboard Jungle,” starring Glenn Ford.  From This Day in Rock.com

And just because:

1976 – No. 1 Chart Toppers Pop Hit: “Afternoon Delight,” Starland Vocal Band. The song’s title is taken from a menu at a Washington, D.C., restaurant. From This Day in Rock.com (extra points if you can make it through the whole video)