Nearly 20 years ago, Robert Stiles discovered 29 unknown works by virtuosic bassist and composer Serge Koussevitzky. Now, Stiles is the Principal Librarian for the Detroit Symphony Orchestra, where he puts his knowledge of music history and U.S. copyright law to work. Stiles spoke with Ann Delisi about his early career, discovering Koussevitzky’s works, and gives a behind-the-scenes look at how orchestra find and obtain the music for their performances.