(Photo: SF/Monika Rittershaus) Bohuslav Martinů’s opera “The Greek Passion” is a work still in search of its audience. The opera, seldom performed, is considered to be one of Martinů’s finest compositions. This season’s Salzburg Festival tried hard to make “The Greek Passion” a rare and visually noteworthy production. But it didn’t quite work out. The opera’s political radicalness and musical accomplishments are {…}