Sergiu Celibidache conducts Anton Bruckner’s “Mass in F minor”, which Bruckner called “the most difficult of all masses”. The film documents the work process from the first rehearsals with piano and choir to the eventual integration of choir, orchestra and soloists. The musical structure, initially created in Munich, is adapted to the acoustic requirements of St. Florian, and then performed in concert. Anton Bruckner was the organist at St. Florian as a young man and wrote many of his masterpieces here – he is buried underneath the organ.