This book constitutes the refereed proceedings of the 17th International Symposium on Computer Music Multidisciplinary Research, CMMR 2025, held in London, UK, during November 2025. 

The 20 full papers included in this book were carefully reviewed and selected from 104 submissions. They were organized in topical sections as follows : Designing, Composing, and Perceiving Sounds and Space; Auditory and Multimodal Perception; Computational Musicology and Music Information Retrieval; Human Auditory Ecology and Creative Practice; Music Learning and Collaborative Sound Practices.