It's too bad Mr. Haight's last name wasn't something like "Benson," because that really would have worked well with this theme. There were Bs everywhere! I'm not going to count them, but the theme was heavy, and I liked it. I'll even tolerate ABRIM (7D: *Nearly overflowing), and BUGBEAR (9D: *Bogeyman) (a word I hate) (two words I hate, really, if you count the clue), because I like the density so much.
I didn't know that BELABARTOK was the 46A: *Hungarian composer whose only opera is about 17-Across (BLUEBEARD). (I suppose the music majors did, however.) And I don't hear BACKBITERS (32D: *Ones who criticize others in their absence) as often as "back-stabbers), but I don't have any problem with it the way it is.
This was a good Monday.
Sorry the review is so short, but although we're back doing the reviews, we are still on vacation, and it's time for me and my AMIE (28D: French girlfriend) to go find somewhere to eat in Lille!