That will work for the videos that youtube tags as music releases, but I also pull music from videos that don't conform to that correctly.

For example, if I wanted to download Better Luck Next Time by Bombs Away (a random example from the My Mix playlist right now), it would set "Artist" to "Central Station Records" and "Name" to "Bombs Away - Better Luck Next Time [Official Video]". I have a reasonably diverse and sometimes niche music taste, so that problem would crop up a lot, and at that point it's just easier to do it myself, but it would work well for some people =)

I have a python script set up so I can just do "./id3.py artist name filename" and it'll do all the id3 stuff for me (apart from thumbnails, still working on that)

I realise my workflow isn't ideal for some people who want everything to "just work" but I'm happy enough to sort out filenames and stuff like that myself, it makes me feel happy. I do the same with my very legally acquired films and tv shows too