[LongMan]

what I think has value is to add an art type for the album cover (at least for single-song music videos).  I see a couple possibilities:
    a.  Use existing "poster" art type for an album cover.  The problem here is that the poster is intended for a 2:3 aspect while an album cover is 1:1.  The advantage is all skins (AFAIK) support poster for music videos out of the box.
    b.  Create a new art type "cover" which would be defined as the album cover with a 1:1 aspect.  The drawback here is that this adds yet another art type which has to be supported in skins.  The advantage is it's easier to skin since the meaning and aspect of the art is known.

How important is album art to music videos. After all, there is never really an album of music videos released. Well, maybe something from Michael Jackson. Most music videos are singles really. Maybe we should consider displaying the Artist's poster and fanart along with the thumb of the video as the main types of art for music videos. Add album art as another piece of art similar to disc art etc for music.

With the rise of digital platforms, quite a bit of music and their corresponding videos are released as singles. Artists are having hit singles long before having an album.

There currently is no way to add artist art for a music video artist that isn't in the music library.

Maybe that should be reconsidered. Music videos can be works of art independent of the music. Some of these are mini movies. putting an artist.jpg and fanart.jpg in the artist folder is a possibility