Development of Creative Commons licenses

[Sal Randolph <sal AT highlala.com>]

Hi!

I've recently gotten a question from a user about incorporating music 
from the opsound site (which is all under the Attribution-ShareAlike 
license) into what they describe as "commercial websites".  My guess 
would be that any page which used by-sa music (as, say, background 
music for the page experience) would need to be itself licensed as 
by-sa.  In other words, it would be considered a derivative work.  It's 
also my understanding that a movie using by-sa music as soundtrack 
would similarly be a derivative work.  Is this correct?  And how about 
a page which merely linked to the music but didn't play it?  That seems 
like it wouldn't be a derivative use, no?  Is there a good source on 
the cc site or elsewhere that I can refer people to in terms of 
understanding the definitions of derivative work?

All the best,

Sal