This dissertation examines aspects of the creative practice of Muhal Richard Abrams, composer, improviser, pianist, and cofounder of the Association for the Advancement of Creative Musicians (AACM). Abrams’s work intersects with various facets of creative music. I focus on free improvisation, both as a stand-alone performance and in conjunction with through-composed music, his engagement with writings by theorist Joseph Schillinger, and his work as a composer. This study provides an historical overview of Abrams’s life and output, supplies analytical accounts of his music and creative practice, contributes to critical issues in music theory and analysis through these examinations, and diversifies the music, musicians, and topics that comprise the discipline of music theory.