I also have Berger's Guide to Chamber Music. I find both books enjoyable and useful. The Guide to Choral Masterpieces is organized alphabetically by composer. Chronologically it ranges from Renaissance composers such as Josquin des Prez, Monteverdi and Palestrina to Michael Tippett, a composer still living at the time of the 1993 publication. Many famous 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.
