Originally Posted by Pocket-full-of-gold
The very nature of youtube is visual (hell, we could argue the very nature of popular music in this day in age is visual. Thanks to MTV, it would appear that a band or artist is only as good as their accompanying video)
You could argue that music is almost always an audio-visual experience. Generally you will see musicians and vocalists and props and dancers or recorded music with interesting cover art.
They knew a bit visuals and music back in Mozart's day ... even prehistoric times! It's not like tribal people don't dress up to dance.