For anyone who thinks that films were very bland and avoided dark topics in the 'good old days', then try watching "Hell's Bells". I'll say it's a dark film! In fact, what can be darker than setting it in Hell! Yes, a children's cartoon in Hell--and many, many decades before the South Park movie!!
It's a cartoon from Disney marketed under the Silly Symphonies umbrella--a series of cartoons that featured lost of singing and dancing and not the familiar Disney characters like Mickey or Goofy. In this case, various demons and animals cavort about--having a pretty good time in jolly old Hell!
The cartoon is black & white (the norm for 1929) and has some very nice classical music. While audiences of today probably won't be bowled over by the film (aside from its locale), for the time it was quite the achievement. Worth seeing if you love old cartoons--for others it might be a bit of a chore.