http://www.guidestar.org/FinDocuments/2012/912/061/2012-912061474-098baa77-9.pdf
here is a copy of their last tax return, interesting reading.
I love this "KEXP's mission is to enrich people's lives through championing music and discovery"
and
"Non-commercial radio programming to further the exempt purposes by bringing culturally and technologically meaningful music experience to the general public."
You can only imagine what KRAB wrote on their tax papers back in the day....