The two art fields are happening! :D Two requests out of two comments is good enough for me!

Playlists (like all fanwork types) will have the Fanwork Notes field, which will appear at the top of the playlist.

You will be able to select more than one genre for all genre fields. If you're familiar with the new SWG site, the audio genre list is already in place for Audio fanworks; the music genre list will behave the same way. Also, the genre field is always optional, so if the mix is so eclectic that tagging by genre isn't going to be useful to visitors, it's possible to just skip that field entirely.

Thank you for the questions and feedback! ^_^