At night, ten different species of frogs convene in a marsh. Fireflies light up the scene and Maestro bullfrog raises his baton. The music begins, softly at first, but builds to a crescendo as the night goes on. Just before dawn, the frogs depart--but the serenade is not over... Although the story is a fantasy, each of the different species of frogs has been carefully portrayed, and described by the author in an Afterword. The musical terms are defined in a glossary. Young naturalists who are fond of frogs as well as youngsters who enjoy music will have a wonderful time as part of the marsh's nocturnal audience.