Due to the absence of any plot details or character information for the film 'Ein Lied verklingt', an evaluation of its LGBTQ+ portrayal cannot be conducted. There is no basis to determine if LGBTQ+ characters or themes are present, or how they might be depicted.

Based on available plot summaries and cast information for 'Ein Lied verklingt' (1936), there are no identifiable transsexual characters or themes present in the film. The narrative focuses on a singer's romantic and professional struggles, without any indication of transgender identity or related issues.

The movie does not contain any action or adventure elements.

There is no widely known source material or historical basis for "Ein Lied verklingt" (1939) that establishes characters with a different canonical gender prior to the film's release. Therefore, no gender swaps can be identified.

This 1939 German film is not an adaptation of a work with canonically established character races, nor is it a biopic of a historical figure whose race would be subject to a swap. There is no evidence of any character being portrayed by an actor of a different race than originally established.