They just complement one another so well, y'see.
First, from maus_merryjest - a video which I believe he enjoyed more with the sound off. Yes, Miss Enya has become the musical equivalent of the quaint orphans and puppies with the really huge eyes, a sort of velvet-enya to match the velvet-elvis in terms of originality. Still, her songs are pretty, and they don't challenge her or her listeners in any way, and that fits this video, which is just pretty, dammit.
Equally artistic, from normanrafferty, a BucketHead song - heavy metal - to animations of Hieronymous Bosch. This is not pretty, but it's gorgeous, and fortunately it has no words.
This, ganked from snobahr, does have words, fortunately in German, because if they were in English, it would be so inutterably geeky that my brain would melt in abashment at the memories which it brings up:
And finally, because gothfather has impeccable taste (and wants to eat your brains, and has a recipe with which to prepare them) there is this gem.