If it's any comfort, Brecht himself screwed around with the spelling of his name; his parents named him "Berchtold," as I recall, but he changed it to "Bertolt" because it seemed more modernist and aggressive. Kinda like Robert Zimmermann morphing into Bob Dylan... I suspect the young Brecht had quite a bit in common with Dylan, actually.

Great entry, A. If you want to know more about Hanns Eisler, this site

http://eislermusic.com/

is excellent. And: I own a video of the movie "Solidarity Song," about him and his music.