I also have and liked Berger's Guide to Choral Masterpieces. I find both books enjoyable and useful. The Guide to Chamber Music is organized alphabetically by composer. Chronologically it ranges from Renaissance composer Giovanni Gabrieli to composers still living at the time of the 1985 publication such as Elliot Carter, Aaron Copland, George Crumb, Jacob Druckman, Leon Kirchner, Leo Kraft, Ezra Laderman, Witold Lutoslawski, Olivier Messian, George Rochberg, Gunther Schuller and Elie Siegmeister. And as that list testifies, Berger doesn't just go with the usual suspects. Many pieces are analyzed in detail. I appreciated the discography at the end, even if it's now dated. A fun book to browse and help expand your musical library.
