The Beatles
Many would say that the first ever music video was The Beatles A hard days night (1964) , the whole idea behind the film was to give thier fans a glipse of them whenever they wanted to and not just at live shows also the film showed the Beatles in a behind the scenes way.
Bob Dylan
His video Subterranean homesick blues unlike The Beatles a Hard days night, had some sort of relation from the lyrics to the video.In the video we see Bob himself hold up cards with the lyrics written on them.This could be Bob Dylan trying to emphasise his lyrics by putting them on the screen.