If you know of other music-specific groups publicly supporting or opposing SOPA that are not on this list, please let us know. And thanks to proptone.com for the tip!
American Association of Independent Music (A2IM)
American Federation of Musicians
American Federation of Television & Radio Artists (AFTRA)
American Society of Composers, Authors & Publishers (ASCAP)
BMI
Bose Corporation
Capitol Records Nashville
CBS Corporation
Christian Music Trade Association
Church Music Publishers Association
Church Music Trade Association
Country Music Association
Country Music Television (CMT)
Disney
EMI Christian Music Group
EMI Music Publishing
Gospel Music Association
Lost Highway Records
MCA Records
Mercury Nashville
National Association of Broadcasters (NAB)
National Music Publishers' Association (NMPA)
National Songwriters Association
Provident Music Group
Recording Industry Association of America (RIAA)
Republic Nashville
UMG Publishing Group
Universal Music Group Inc.
Warner Music Group (WMG)
Warner Music Nashville
Word Entertainment
Grooveshark
The Hype Machine