What to read after Choral Music in the Twentieth Century?

"Nick Strimple's personal yet all-encompassing survey ranges from the early days of the century, when such nineteenth-century masters as Elgar and Saint-Saens were still writing their final works, to the very recent past, in which composers as diverse as Tan Dun, Paul McCartney, Morten Lauridsen, and Arvo Part have explored new directions for this popular art form. The geographical scope is just as sweeping: arranged by country or region, the book includes not only European and American idioms but also less familiar music from Africa and the Middle East, Latin America and the Caribbean, and the Pacific Rim.".