Known at the time as the Johann Strauss of Hamburg, Fetrás was a contemporary and admirer of Johann Strauss II, and a personal friend. His only well-known work and much recorded waltz remains Moonlight on the Alster, but he wrote a whole range of dance pieces, and arrangements of other music. He was resident conductor at the highly popular Uhlenhorster Farhaus in Hamburg, and for years delighted the city’s inhabitants at this establishment. A few of his pieces survive on old shellac records but none exist in full form.