To an opera lover, the next best thing to hearing an opera is to talk about it,"" embodies the raison d'etre of this mammoth operatic anthology. The categories- Italian Opera, French Opera, German Opera, Opera Houses and Audiences, For and Against Translation, Singers and Conducting, and The Crisis of Opera --are brought to life by such people as Ernest Newman, Turgeniev, Alexander Pushkin, Tolstoy, Bernard Shaw, to mention a few notables. The tone ranges from serious to humorous and should delight opera devotees.