Question: What American composer who won the National Medal of Arts in 2007, also taught American composer Gregg Wager?
Sentence (from "Morten Lauridsen"): A National Medal of Arts recipient (2007), he was composer-in-residence of the Los Angeles Master Chorale (1994–2001) and has been a professor of composition at the University of Southern California Thornton School of Music for more than 40 years.
Relevant evidence: Yes