If you think that MTV invented music videos, you are in for a little surprise known as the "Soundie." These were short films of musical performances by popular acts of the day, often featuring some dancing. Soundies were played on a coin-operated film jukebox called a "Panoram," which would often be found in bars, breakrooms, nightclubs, restaurants, etc. The Panoram used a series of mirrors to project the image, and the films were actually printed backwards (a mirror image) so they would appear correctly on the machine. As a result, archive versions of Soundies may look a little odd because they are the reverse image.
From the Internet Archive, here is a hot, little number by Thelma White and Her All-Girl Orchestra called "Hollywood Boogie."