The book, which was published early this year and is available unbundled from the CD-ROM for $69.95, contains information on more than 800 composers and examines some 1,500 operas in detail. Each composer's musical career is outlined, with an assessment of his or her overall contribution to opera. Opera entries include cast lists and orchestral forces, a commentary on the background of the work, a synopsis of the plot, and a musical analysis identifying musical highlights and points of interest. Recording and edition information is included. For those who don't like to turn pages, prefer to read from the screen, or just like the click-click of the mouse, the CD-ROM provides computer access via Windows to the information and pictures (small black and whites) of the book. The CD-ROM holds some enhancements: notably, three hours of music excerpts (unheard by this reviewer who lacks the needed 16-bit sound card; some, according to the press release, are as long as three to five minutes). Annotation copyright by Book News, Inc., Portland, OR