I have a few suggestions for enhancing Music Audio and Music Video support:
(1)  PLAY MUSIC VIDEOS WHEN PRESENT
Now that I’ve synched the filenames of all of my M4V files to match their M4A counterparts, it would be awesome if there was an option to prioritize the playback of Music Video over Music Audio when a corresponding video is present.
(2)  MUSIC VISUALS
When a song doesn’t have a corresponding Music Video, show something visually interesting in its place, like a slideshow of band images, band trivia, upcoming tour info, song lyrics, or music-sensitive visualizations (Electric Sheep for music, anyone?)
(3)  CROSSFADES
When going from one Music Video to the next, employ a random digital crossfade (dissolves, wipes, fades, swipes, etc).
(4)  MTV-STYLE OVERLAYS
Using either embedded metadata or information from Gracenote, have intros and outros similar to Mtv (back when they actually played music videos) including Album Art when available.
