Female composer in the expressionist style. She was a Violist, rather good as well. She wrote under a male pseudonym because female composers appeared not to be received too well.
I'm liking "Morpheus" at the moment, it's not too unsung but it's not very well known outside the Viola repertoire!
www.youtube.com/watch?v=Rp7vFPWLM_M (http://www.youtube.com/watch?v=Rp7vFPWLM_M)
Absolutely fantastic piece, it's really good. Morpheus was the (I think) Greek God of Dreams. This portrays that aptly.
God of Sleep, actually - though that would include dreams, of course.