Night on Bald Mountain (segued into Ave Maria), from the original Fantasia.
I first saw this when I was 8. Frightening and exciting at the same time.
And the Dead with Warren Zevon’s Werewolves of London –
I woulda had Zevon up there, but didn’t really much like the videos I found.
Seemed right for All Hallow’s Eve . . . .