heh... this has been an ongoing problem for me.

Oddly enough, I have a lot of albums by William "Bootsy" Collins. Sometimes he's 'Bootsy Collins', sometimes it's 'Bootsy's Rubber Band', other times it's 'Bootsy's NEW Rubber Band'... etc, etc...

I used to go by accuracy... but then there were situations were that didn't work out so well. I've since changed all artist fields to 'Bootsy Collins' as that is how I refer to the musician. It may not be 100% accurate, but it makes searches easier for me. I then place the artist listed on the cover art in the Comments for posterity.

As far as "Featuring" situations I've only come up with a mildly annoying kludge. Normally I list the Artist as the main artist... and add the supplemental artist to the track name. Like "Funk Ain't Broke (w/ That Other Guy)".

In really obsessive cases, where I can't decide who is the main artist I actually make two copies of the song... but then I use a new bar of soap every time I wash my hands.