Animated movie from the 80s with bad singing?

At the moment, all I can recall is what I believe is the ending scene from an animated movie from possibly the 1980s (maybe 70s): these characters are on a drawbridge and a young boy begins singing as everyone walks into the castle.

The singing is horrible and basically feels like a punishment for another character having to put up with it. I believe this is a running gag through the film, of these characters singing and listening (might be his older brother). The young kid might have a guitar.

I believe this takes place in medieval times, with castles, though not sure of the plot beyond that. It almost feels like it might have the Smurfs involved, though I may be completely wrong, and when I’ve researched actual Smurf movies, none seem to be right, at least plot-wise. Language is English in the film, though it’s possible a country outside the US made it.

This feels like a total shot in the dark, so thank you for any help!

9 thoughts on “Animated movie from the 80s with bad singing?

    1. Doubtful, as I don’t believe I’ve ever seen that. Just watched a clip online, and it doesn’t ring any bells. Thanks for the suggestion, though!

  1. “The Smurfs and the Magic Flute”(1976)?

    I think this is it. It has smurfs, it’s medieval, has bad singing and a boy with a guitar. I couldn’t find the drawbridge scene, but the clip I found on youtube has most of what you described and is posted below.

    1. Wow, if this isn’t it, I don’t know what is! When I had originally read the description of this movie, it didn’t sound right, but this does check off all the boxes. Funny that it’s not really a “smurf” movie in that there’s a large portion of it without them! 🙂 Thanks very much!

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