Thank you very much for the reply and tips. The way my music room is going to be situated already lends itself to double walls. The two long walls are defined by the I-beams that support the first floor. I was going to stud on either side of these beams, so essentially making a doudle wall sans 2x6 staggered configuration (if my lame description makes sence.) I was trying to save a buck, but it looks like a poor choice on my part was diverted. I really like the idea of offset studs mounted on 2x6's - I'll measure my I-beams again and see if I can get by with this dimension. Did you see the HT posted by darius under the HT forum? (http://www.audioroundtable.com/HomeTheater/messages/30.html) WOW!!
Thanks again, Colin