This mosaic, unsigned, is on the exterior wall of the Writing Lab of East Los Angeles College. Everyone seems certain that this used to be the Music Building, but other than that, not much is known about the mosaic itself or when it was installed.
Here's a close-up on the left. My thanks to Professor Daniel Lambert for these pictures.
So, please, anyone who knows anything about the mosaic or the artist--who must be a cat lover--drop a line in the comments!