Here is a list of more organizations doing good work to promote diverse programming. Most of these organizations have some but not tons of overlap with BIPOC Voices, so hopefully if you’re looking for things you couldn’t find here, these links will help you out.
Canadian Art Song Project: A list of some Canadian composers of art song
Racial Justice Opera Network: OPERA America’s Racial Justice Opera Network is an action group of opera stakeholders from all sectors of the field who are committed to enriching our art form and industry by seeking racial equity.
Sphinx Composer Resource Directory: A list of several resources of BIPOC composers (vocal and non-vocal music)
Institute for Composer Diversity: Several databases of genre-specific works by diverse composers. Repository for the concert works of composers of the African Diaspora. Database of works written by historically excluded groups
American Composers Alliance: A list of many works in different genres by BIPOC Composers. Music of BIPOC composers in the ACA catalogue.
Chamber Music America: A list of ALAANA, Female, and Gender Non-Conforming Composers
BIPOC Arts: Database of BIPOC arts workers, including composers and librettists
ROCO: List of works comissioned by ROCO. Many of the creators are from equity-seeking groups.
African Diaspora Music Project: A repository for the concert works of composers of the African Diaspora.