The IWBC commissions works from women composers for its biannual conference. For the 2021 conference, the composition competition will be for a collegiate level trombone ensemble piece. The piece must have a minimum length of five minutes and have been written after January 1, 2018. It may have been previously performed or published, but should not have won any other competition. All submission will be anonymous. Each composer is limited to one submission. The competition is free and open to women composers of all ages and all nationalities. Past winners are not eligible.