Slightly off tpoic, but I just got through with a book by Dean Koontz about Frankenstein & his monster, and the monster is the hero. Frankenstein, however, really is a monster (just MHO), and not just because of his actions!
So to get back on track, if Koontz is right ( ) then we had it wrong all these years!
The problem there is that AllMusic doesn’t (couldn’t) live up to the name. The vast majority of small pressing novelty singles from the most relevant time period won’t be in there. The Google approach is likely too broad. As good as anything else for ballparking I guess.
Nightmare City has the biggest monster-song discography I’ve seen on the Web. Scroll down to “Halloweenish Songs” and “Halloweenish EPs/Singles” about one-fifth the way down.