These are the descending-by-play-count artists aired on KCRW during the time window you've chosen. View an artist and you'll also be able to see which songs made them popular. If you want to search and find if a particular artist was played (during your chosen time frame), use the the filter to find them. Be aware, I'm not google and the search performed here won't really account for fuzzy hits so you'd better type the the artist's name correct (and hope that whoever entered the data did the same). If you don't get any hits, try searching over a longer time period.