Andrew Ward is the author of “Dark Midnight When I Rise: The Story of the Jubilee Singers, Who Introduced the World to the Music of Black America” (Farrar, Strauss & Giroux). The Jubilee singers were nine former slaves who who set off from Nashville in 1871 to raise money to rescue their school, Fisk University, from bankruptcy. They toured the U.S., Britain, and Europe introducing audiences to African-American spirituals. The Jubilee singers are also the subject of an upcoming American Experience documentary on PBS. (Monday, May 1, 2000 at 9:00)