This site allows you to visualize all the play history from KCRW spanning from 1992, the earliest data available, up to now. You have the option of viewing the play history of the many hosts of KCRW, or the artists and songs played by those hosts over the years. By default, the complete database is shown.
You can also specify arbitrary date ranges or go to the Date Filters page and find some quick filter buttons.
For updates and/or discussions of interesting observations, read the KCRW-relevant posts on my blog.