I only recently discovered Jiri Trinka's work. I stumbled across a GoodTimes DVD called EXTREME FAIRY TALES for a couple of bucks that featured THE EMPEROR AND THE NIGHTINGALE, narrated by Boris Karloff. Later, I found that film, along with some other Trinka shorts and a documentary, on a DVD called THE PUPPET FILMS OF JIRI TRINKA (or something like that). I think NIGHTINGALE was also released by Fox/Lorber, possibly as part of their CARTOON CRAZYS series. (Although not all of the animation volumes bore the Cartoon Crazy logo...such as Fleisher's GULLIVER'S TRAVELS.)