Arnold Krille schrieb:
  If you choose a SA-option, others might use parts of
your music in their works
 (of course giving credit to you!), if you choose an non-commercial option,
 they can't sell these derived works.
 Note that you can still sell the music and are not bound to the NC because you
 are the copyright-holder, you can license your music to others under what
 license you choose. You can license it as CC-SA-NC and at the same time make a
 fortune selling commercial rights to warner... 
Might be of interest:
http://createdigitalmusic.com/2009/12/30/cdm-and-non-commercial-images-regeā¦
If I remember correctly, discusses the ambiguity of NC and SA as a
possible alternative.
Burkhard