CCMSAI 2026 (Co-Creativity in Music, Sound, and AI) is a scholarly publication unit associated with the University of California, Riverside, dedicated to disseminating research presented at the CCMSAI 2026 conference. The collection brings together peer-reviewed contributions from scholars, composers, and artists working at the intersection of music, sound, audiovisual media, and artificial intelligence. It focuses on theoretical, artistic, and technical perspectives on co-creativity, including human–machine interaction, algorithmic composition, improvisation, and AI-driven creative practices. The series provides an open-access platform for documenting and advancing current research in this rapidly evolving interdisciplinary field.