Well I could be going totally nuts, but I swear that you used to be able to make a smart playlist and say something like artist is Abba and artist is whom ever but do not use genre equals soundtrack.
but now if I say genre not equal soundtrack every song not a sound track adds to the list...
I used to have a smart playlist that was audio books and such and I used to say do not use that list... now I can not figure out how to do that again...