Florian Hermann - Waltz Hommage

Hommage was a waltz composed by Hermann, part of it was used to create the gypsy romance "Black Eyes" by Sergei Gerdal, a mystery surrounds the theme, since there is no information about Hermann or about Sergei, who used several names in his compositions ( Sophus, Sofus, Soifer, Gerdal ). Strange case since "Black Eyes" is a known waltz, therefore it is to be expected that there would be information about the author, which is not the case.