I just clicked through from the Mudcat to another favourite site - and learnt that someone I only know through reading and the Internet has just died on June 2nd.
Marsha Forest has been a central figure in the struggle to get our society to respect and include people who are excluded - espeiclly people with disabilities (like my own daughter), but also other groups - native peoples and others. She lived in Canada.
I don't know whether Marsha sang songs - I'm pretty sure she must have, because she comes across as that kind of person.