This CD really deserves two reviews, one for its technical merits, which rate highly, and one for its usefulness to the birder, which rates very poorly indeed. So I'll compromise at three stars. If you are on a budget, you can pass this over with the confidence that your pennies will be better spent on Lang Elliott's superb Stokes guide. If you want a little something extra for pleasant listening and have the cash to spend, then go ahead and buy it, but ONLY if the essential Stokes CD is already on your shelf as a definitive reference.
Most of these same criticisms apply to the Peterson guide to western bird songs, which contains two CDs, about 500 species, and must place second to Kevin Colver's western guide in the Stokes series.