The best of two birding tools combined into a leather package:  The Birds of Wisconsin Field Guide and the companion Audio CD.  This book and CD set are designed for each other.  The track number at the bottom of each page in the Field Guide directs you to the correct CD track to hear the birds' songs and calls.  Likewise, the Audio CD index references the Field Guide.  After you listen, you can find a photo and more great information about the bird.  Both sight and sound for all the Wisconsin birds.  By Stan Teliela