This issue falls under publicity laws. A number of states recognize a right of publicity, which is the right of an individual to control the commercial use of their name and likeness. Unfortunately, New Mexico does not recognize a right of publicity at this time. California, among others, does recognize a right of publicity. The use of your friend's voice in commercial music may may well involve copyright infringement, however. I suggest that your friend contact a local entertainment attorney to discuss his or her options for pursuing the matter.
Answered on Sep 12th, 2011 at 3:03 PM