The Singing/Golden Harp also in DuckTales
I just watched "The Lost Harp of Mervana!" and couldn't figure out where I saw it before. Imdb trivia mentions this short, which is part of the Fun and Fancy Free blu ray. I must have seen it on Disney in the 60s.
Review & screenshots https://www.blu-ray.com/movies/Fun-and-Fancy-Free-Blu-ray/91661/