Question: What concept did the father of Siegfried Wagner revolutionize?
Sentence (from "Richard Wagner"): Initially establishing his reputation as a composer of works in the romantic vein of Weber and Meyerbeer, Wagner revolutionised opera through his concept of the "Gesamtkunstwerk" ("total work of art"), by which he sought to synthesise the poetic, visual, musical and dramatic arts, with music subsidiary to drama.
Relevant evidence: Yes