Neither Stahmer nor Stockhausen.
Time for a hint.
I've mentioned this composer on the B.com Bulletin Board at least once. (That leaves you about 4500 posts to look through
. I've Googled the composer's name, and found considerable info, but the name does not show up when Googling 'classical composers'. Some of the composer's works (including the answer to this challenge) would not be unwelcome on Beethoven.com, but I don't think they have any of works by this composer in the playlist. I have requested works by this compsoer before, but have never heard any of them played.