If you are looking for music composition communities, associations, forums, and organizations, this page is currently just a "placeholder," but I imagine it will grow to become quite the list!
National Association for Music Education (USA) - The mission of MENC: The National Association for Music Education is to advance music education by encouraging the study and making of music by all.
Washington Composers Forum (WCF) - a non-profit arts organization that nurtures the creation, performance, and dissemination of new music by composers living in Washington State.
Seattle Composers Alliance - a non-profit professional organization made up of working composers, students, and others interested in professional music composition.
American Composers Forum - links communities with composers and performers, in the making, playing and enjoyment of new music.
American Music Center - a national service and information center for new American music.
American Composers Alliance - a membership organization serving over 200 professional American composers of concert music.
International Alliance for Women in Music - a global network of women and men working to increase and enhance musical activities and opportunities and promote gender equality.
Genesis Foundation - a UK-based charity created in January 2001 to support young artists in a variety of art forms.
Composersforum.net The sister forum of music-composition-studio.com. A young forum that will, in particular, feature a section on "the teaching of music composition" Come and join us!