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Cover picture: The spectrogram of a zebra finch song (top left) shows the complex temporal structure (x-axis) and the complex spectral structure (y-axis) that are characteristic of animal vocalizations. We generated a family of synthetic songs that preserved different amounts of spectral versus temporal structure of the original song. The temporal structure was preserved with resolutions ranging from 1 msec (top middle) to 256 msec (bottom right). The spectral resolution is the inverse of the temporal resolution. These synthetic songs were used to probe the spectral and temporal requirements of complex auditory neurons in the zebra finch forebrain. For details, see the article by Theunissen and Doupe, in this issue (pages 3786-3802).