Schultz has been defeated by Candie, but we don't think he's particularly bothered about it.
After all, he has won Hildi her freedom.
12K is a lot of money, but he can make it back in a couple of handbills - especially with Django's help.
No, what's bothering him are the brutal memories of seeing d'Artagnan torn apart by dogs.
It sickens him so much he can't stand to hear the music of Beethoven, pulling the harpist's hands away from the instrument and demanding she stops.
It's not clear exactly why he does it - perhaps he doesn't want the beauty of Beethoven sullied by his thoughts, perhaps he doesn't want to be reminded of home, perhaps he doesn't think this pack of racists deserves to hear such wonderful music - but his anger and passion makes its own point.