Music Television (MTV) debuted on August 1st, 1981. At 12am, footage from the Apollo 11 launch was played, followed by an astronaut planting an MTV flag on the moon. The first music video aired was Video Killed The Radio Star by The Buggles - highlighting a new era of music and television.
Video Source: https://www.youtube.com/watch?v=8zffqSWaY6U
MTVs First 4 Hours: https://archive.org/details/1981.08.01_MTV_First_Four_Hours_Remastered_12am_Saturday_August_1st_1981