Development of Creative Commons licenses

[m AT rcell.net]

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hi,
some people from nyc asked artists from croatian GNU GPL based 
publishing label EGOBOO.bits about using EGOBOO.bits music in remix
album. we used GNU GPL but plan to use by-sa cc licence instead of it
in the future and due to that fact our questions are: 

1. does by-sa licence require all of the music on remix album to use
by-sa compatible licence? 

that means that nyc people can't use copyright music together with
by-sa copyleft music on their remix cd even they got the permission to
use copyright music but didn't get the permission to change the
licence to by-sa....

2. if someone want to use our GNU GPL (by-sa) music in their video
work does that video work needs to be by-sa? if yes, what is the cc
licence which will be sort of LGPL and will allow video artists to use
it in its unchangeable form but if they will use part of it and modify
it in any way than they need to publish they work under by-sa?

thanx

keep up the great work there ;)

m AT rcell.net
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