I don't understand share-alike section in CC license of Musicbrainz. It reads:
You are free:
to Share — to copy, distribute and transmit the work
to Remix — to adapt the work
to make commercial use of the work
Under the following conditions:
Attribution — You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work).
Share Alike — If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one.
So doesn't it mean if I build upon this work I have to use same or similar license, but it says in the upper section I can make a commercial use of the work. My question is; how can someone make a commercial work and share the work with the public at the same time? I am confused a little.