Dave, the details that I would mainly be looking for are album, artist, song/track name. That way if we learn a tune at a session I can easily find what recorded versions of it I may have and quickly find the relevant CDs. Other information can be included in mp3 tags, e.g. date, genre, key but they are of lesser importance to me.

Arkie - thanks for the MM tip, I'll look into that. Like you, I haven't had satisfaction from other tag writers.