Question:  Sigur Rós' EP consists of the songs the group composed for an American dancer and choreographer who was at the forefront of the American modern dance for more than how many years?
Sentence (from "Merce Cunningham"): He is also notable for his frequent collaborations with artists of other disciplines, including musicians John Cage and David Tudor, and artists Robert Rauschenberg and Bruce Nauman.
Relevant evidence: No