Uniting scientists who study music, child language, human psychoacoustics, and animal acoustical communication, this volume examines research on the perception of complex sounds. The contributors' papers focus on finding a common principle from the comparison of the processing of complex acoustic signals. This volume emphasizes the "comparative" and the "complex" in auditory perception. Topics covered range from communication systems in mice, birds, and primates to the perception and processing of language and music by humans.