Development of Creative Commons licenses

[Kevin Shrieve <kevin AT lumiere.net>]

Let's say I, Artist #1, license a song (music and lyrics) under the 
by-nc-sa license.

Artist #2 makes a derivative work and licenses that under the by-nc-sa.

Artist #3 makes a derivative work from that of Artist #2 and wants to 
use that song commercially.

Does Artist #3 have to get permission from all the artists given 
attribution on that piece (Artist #1 and Artist #2) in order to use 
that song commercially?

Thanks a lot,

Kevin

http://www.mp3.com/DreamArtScience/