For anyone not familiar with the Comedian Harmonists, this 1930s German boy group have astonishing skills with harmonies, funny vocal effects (they're mostly a cappella except for the piano), and silly, poignant, or rousing lyrics. Great if you speak German, and you can find many of the lyrics online. I have a friend who doesn't speak German but still adores the Comedian Harmonists because of their clever arrangements. There are two films about the group, one a documentary and the other a dramatization of their career, and amazing story of brilliance and success until the Nazi movement cut it short. Some of the tracks were remastered for the film, and you can tell because the quality of the sound is better.