Ultrasonic Songs of Male Mice

"Here, we provide a quantitative description of the ultrasonic vocalizations of the adult male mouse, and show that they display unexpected richness, including several syllable types organized into phrases and motifs. Thus, these vocalizations display the characteristics of song . Different males, even though genetically identical, show small but significant differences in syllable usage and the temporal structure of their songs. These results indicate that communication among mice may be more complex than previously appreciated."

Timothy E. Holy/Zhongsheng Guo
Department of Anatomy and Neurobiology,
Washington University School of Medicine, St. Louis, Missouri
PLoS Biology December 2005
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Popular story in the news feeds, but the Plos link has...wav files! Of mice! Singing!
This small file gives some hint as to what's what.
This 1.6 mb file is world-changing.
The single most significant thing the Internet has shown me, right there.
There are graphs, also:
Male Mice Vocalize in the Ultrasound