Composer Organizations

American Composers Forum:  https://www.composersforum.org
American Society of Composers, Authors, and Publishers (ASCAP):  https://ascap.com
Broadcast Music, Inc. (BMI):  https://www.bmi.com
Cleveland Composers Guild:  https://clevelandcomposers.com
Society of Composers, Inc.:  https://www.societyofcomposers.org
Southeastern Composers League:  https://southeasterncomposersleague.org
Wisconsin Alliance for Composers:  http://www.wiscomposers.org

Support Organizations 

American Academy in Rome:  https://www.aarome.org
Classical Music Composer List:  https://www.naxos.com/composerlist.asp
Contemporary Record Society (CRS):  https://www.crsnews.org
highSCORE New Music Center:  https://issuu.com/highscore
International Alliance for Women in Music:  https://www.iawm.org
Kimmel Harding Nelson Center:  https://www.khncenterforthearts.org
Milken Archive of Jewish American Music:  https://www.milkenarchive.org
New Music USA:  https://www.newmusicusa.org

New Music Ensembles

Bang On A Can:  https://www.bangonacan.org
BonkFest:  https://www.bonkfest.org
duo46:  https://www.duo46.com
Indiana New Music Ensemble:  https://www.indiana.edu/~nme
North/South Consonance:  https://www.northsouthmusic.org

Other

ACMP - The Chamber Music Network:  https://www.acmp.net
Arioso.fr - Concert Music's Online Business Directory:  http://www.Arioso.fr
Chamber Music America:  https://www.chamber-music.org
Classical.com:  https://www.classical.com
Classical Connect:  https://www.classicalconnect.com
Classical Music Daily:  https://www.classicalmusicdaily.com
College Music Society (CMS):  https://www.music.org
Composing for Harp:  https://www.composingforharp.com
Conductors Guild:  https://www.conductorsguild.org
Conners Publications:  https://www.connerspublications.com
Film Music Magazine:  https://www.filmmusicmag.com
Film Music Network:  https://www.filmmusic.net
Film Music Institute:  https://www.filmmusicinstitute.com
How to License Your Music:  http://www.howtolicenseyourmusic.com
MMB Music:  https://www.mmbmusic.com
Musical America:  https://www.musicalamerica.com
MusicBizBuzz:  https://www.musicbizbuzz.net
Musician's Atlas:  https://independentmusicawards.com/atlas
National Association of College Wind and Percussion Instructors:  https://www.nacwpi.org
National Endowment for the Arts:  https://www.aam-us.org
New England Conservatory:  https://www.necmusic.edu/career
New Music Box (AMC's On-Line Magazine):  https://www.newmusicbox.org
New York Foundation for the Arts:  https://www.nyfa.org
Oral History, American Music - Yale University:  https://web.library.yale.edu/music/oham
OrchestraList:  http://www.orchestralist.net
Primary Elements:  https://www.primaryelements.com
PrivateLessons.com:  https://privatelessons.com
Sibelius Software:  https://www.sibelius.com
Sigma Alpha Iota Composers Bureau Online:  https://www.sai-national.org/resources/composers-bureau.html
Warren Music Copying:  http://warrenmusiccopying.com
Weltweite Klarinetten Allianz:  https://www.wka-clarinet.org
Wise Music Classical:  https://www.wisemusicclassical.com