Single bubble sonoluminescence (SBSL) is generated by creating and levitating a bubble at the pressure antinode of a standing wave. Previously, it was determined that the SBSL total light intensity evolves during the stabilization process [T. J. Matula and L. A. Crum, Phys. Rev. Lett. 80, 865–868 (1998)]. The evolution process was used to confirm a theoretical hypothesis that chemical diffusion effects were important for stable SBSL. In this talk we report how the emission spectrum evolves over time, from bubble creation to stabilization. SBSL was generated in a 100-ml spherical cell filled with degassed (air) filtered water. Boiling from a nichrome wire created bubbles which were then forced to the pressure antinode. Spectra were recorded with a multichannel PMT (Burle Industries) using 16 color channels in a 4×4 grid with 20-nm bandwidth interference filters covering the range from 250 to 625 nm. Continuous recording of the spectra (with a 192-ms integration time) was performed until the bubble stabilized. Spatial, crosstalk, filter, and tube response calibrations were performed. Temporal evolution measurements showed evidence of an early-stage emission band near 300 nm, suggesting that hydroxyl emission becomes swamped by the continuum during stabilization. [Research was funded by NASA.]