High-speed films were taken of traveling-bubble cavitation on a Schiebe nose while the accompanying noise signal was recorded. These results showed rebounds to generate almost as much noise as the initial collapse. By counting the number of noise bursts occurring for given noise level and flow parameters, it was found that the noise energy per bubble varies with the cavitation number as roughly σ−x above 10 kHz, but not at all with the free stream flow velocity V∞ between 30 and 40 fps. The spectral energy density was observed to be flat, regardless of σ and V∞, from 10 to 100 kHz. Although maximum bubble radii as functions of σ and V∞ were not adequately measured during this study, it is clear that an understanding of this parameter is critical to any cavitation noise theory. The results from this investigation suggest that one might use the linear noise theories for incompressible fluids when analyzing cavitation noise at sufficiently low frequencies. However, it appears that shock wave noise theories are more appropriate for describing the high-frequency noise energy. [Work supported by NAVSEA.]