What role did Aristoxenus play in the study of ancient Greek music theory?

Aristoxenus (flourished 4th century BCE) was a Greek Peripatetic philosopher and a student of Aristotle who became the most significant historian and theoretician of ancient Greek music.12

His primary contribution was shifting the focus of music theory away from the strict mathematical and acoustical dominance established by Pythagoras. While earlier theorists often relied on mathematical ratios to define musical intervals, Aristoxenus argued that the notes of a scale should be judged by the human ear and the listener's perception.13

He emphasized that music is an emotional and functional art, where individual tones must be understood in relation to one another and within the context of larger formal units. His approach integrated both the hearing and the intellect of the listener as essential components of musical experience. Although much of his work is lost, his surviving treatises, such as the Elements of Harmonics and Elements of Rhythm, remain foundational texts for understanding the study of modes and musical structure in the classical world.31