The decade that spawned MTV saw a serious shift in music from the previous one. Much of what was popular were new, untested bands that either had actual talent and thrived (Prince), or catchy one hit wonders (Harold Faltermeyer). The best of both of these worlds that pinned a song on a movie during the 1980's are rounded up, with videos, at ChicagoNow.
For its exciting, educational montage of tournament action in The Karate Kid, the movie features this song by Joe Esposito, "You're The Best Around." This isn't a music video; this was an actual scene in the movie, and it was pretty much the standard practice for musical interludes.