Two playlists that I add to every so often on YouTube are Visual Music and Abstract Animation. They are by no means exhaustive, but I hope to add to this more frequently. If you have any suggestions for YouTube links that I could add to these playlists, please do email me at: mmcd@soundingvisual.com I have other playlists but thought it useful to embed the more relevant ones here.
Visual Music Playlist
Link to Visual Music Playlist:
http://www.youtube.com/view_play_list?p=F5838B01D3B5A7CC
Abstract Animation Playlist
Link to Abstract Animation Playlist:
http://www.youtube.com/view_play_list?p=678CDE1A94F6651C
Experimental Music Video Playlist
Link to Experimental Music Video Playlist:
http://www.youtube.com/view_play_list?p=3AB1EC6363EE36E2