Five discs, 90 years, 106 songs, and three appearances by Law & Order vet Jerry Orbach. That should give you an idea of the awesome expanse of Broadway: The American Musical, a companion to the recent six-part PBS miniseries. Selections range from standard (Cats' hackneyed ''Memory'') to surprising (Nine's sumptuous ''Bells of St. Sebastian'') to clever: Where else can you hear Fanny Brice and Barbra Streisand as Fanny Brice?

