"The Lead Shoes" (1949) is an experimental film directed by Sidney Peterson at Workshop 20 at the San Francisco Art Institute. The film was made using distorting lenses.
Another reviewer notes, "Peterson's reason for making the film appears to make his audience members pray for death, as the singing can only be described as hellishly bad and annoying! It's obvious that he must have been some sort of Dadaist who just liked provoking and bothering the audience instead of entertaining them or making them like his films." I am quoting liberally because I really could not have said it better myself. Even at 16 minutes, this film is a chore to watch with "singing" that will make you slam your head against the wall. As an experiment, I guess it may have some merit, but for the life of me I have no idea why the Library of Congress has decided to preserve the film.