Animal communication hinges on the ability of receivers to extract reliable information from signals, yet little is known about the co-evolution of perceptual systems and these signals' physical properties. We are investigating this relationship in songbirds, which are renowned for their diverse and elaborate courtship songs. One goal of this project is to describe the spectrotemporal features of song in several species. A second is to characterize the tuning properties of auditory neurons in these species and determine whether differences between them relate to differences in song. Third, we are interested in whether early auditory experience affects the development of auditory tuning properties.