Another series, "Fourth Series" (1977–79), included music for chorus and organ ("Part One", 1977), organ and piano ("Part Two" and "Part Four", 1979), and music for a radio adaption of Constance DeJong's novel "Modern Love" ("Part Three", 1978). "Part Two" and "Part Four" were used (and hence renamed) in two dance productions by choreographer Lucinda Childs (who had already contributed to and performed in "Einstein on the Beach"). "Part Two" was included in "Dance" (a collaboration with visual artist Sol LeWitt, 1979), and "Part Four" was renamed as "Mad Rush", and performed by Glass on several occasions such as the first public appearance of the 14th Dalai Lama in New York City in Fall 1981. The piece demonstrates Glass's turn to more traditional models: the composer added a conclusion to an open-structured piece which "can be interpreted as a sign that he abandoned the radical non-narrative, undramatic approaches of his early period", as the pianist Steffen Schleiermacher points out.