Between then and his last appearance there in 1977, Ridderbusch sang the roles of  Fasolt, Hunding, and Hagen in the Ring, Pogner and Hans Sachs in the Mastersingers, Daland in The Flying Dutchman, Titurel in Parsifal and King Marke in Tristan und Isolde. He also sang Hans Sachs at the 1974 and 1975 Salzburg Easter Festivals, and at the Met and at the Chicago Lyric Opera.
Between that time and his final performance in 1977, Ridderbusch portrayed a range of roles, including Fasolt, Hunding, and Hagen in The Ring, Pogner and Hans Sachs in The Mastersingers, Daland in The Flying Dutchman, Titurel in Parsifal, and King Marke in Tristan und Isolde. He also sang Hans Sachs at the 1974 and 1975 Salzburg Easter Festivals, and performed there at the Met and the Chicago Lyric Opera.