Book excerpt: Makis Solomos explores the ecologies of music and sound, inspired by Felix Guattari, for whom environmental destruction caused by capitalism goes hand in hand with deteriorating ways of living and feeling, and for whom an ecosophical stance, combining various ecological registers, offers a glimpse of emancipation, a position strengthened today by intersectional approaches. Solomos explores environmental, mental and social ecologies through the lens of the history of music and current artivisms – especially in the fields of acoustic ecology, contemporary music and sound art. Several theoretical and analytical debates are put forward, including a theory of sound milieus and the biopolitics of sound; the relationships between music and the living world; soundscape compositions, field recording, ecomusicology, and the creation of sound biotopes; the use of sound and music to violent ends as well as considering the social and political functions of music and the autonomy of art, sonic ecofeminism, degrowth in music, and much more.