This article reports a case study of an experienced teacher of composing working with secondary school students in a large urban centre in Ontario, Canada. Results suggest authentic assignments connect student composing to the ‘real world’, and so have meaning and life beyond the music classroom. Teachers can facilitate the development of theoretical music knowledge by supporting and enhancing the experiential learning that students accomplish on their own, through composing. Offering suggestions for change to compositions-in-progress, and cultivating a classroom ethos where students exchange this service amongst themselves, serves to enhance composing potential. By helping students infuse their work with personal knowledge, experiences, and interests, teachers can increase students’ meaningful involvement in classroom composing.