fadedsignals:

MTV famously debuted in 1981:

But the idea of running music videos on TV was not new.  

Several network and syndicated programs offered music videos in the 1970s.  Televak Corporation started Music Video TV in 1974, which would be a music video channel aired in record stores around the country.  The channel expanded to regular cable television in 1978, but was out of business by the time MTV started.

Over the decades, MTV has changed from a pure music-video channel to a network featuring reality shows and general entertainment geared toward youth.  Click below for the full history, Wikipedia-style.

Source: Wikipedia (MTV)

Happy Birthday, old MTV. You are missed.