Drawing on insights from the modern "process" philosophy of Bergson, William James, and A. N. Whitehead, Christopher Hasty's Meter as Rhythm releases meter from its mechanistic connotations and recognizes it as a concrete, visceral agent of musical expression. Hasty reinterprets oppositions of law and freedom, structure and process, determinacy and indeterminacy to form a theory that engages diverse repertories and aesthetic issues. The revised 20th anniversary edition facilitates the work's current contexts of application, from new subfields in ethnomusicology and music cognition to non-music fields like literary studies, physics, and biology.