David J. Elliott & Gary E. McPherson 
Oxford Handbook of Philosophical and Qualitative Assessment in Music Education [PDF ebook] 

The Oxford Handbook of Philosophical and Qualitative Assessment in Music Education offers global, comprehensive, and critical perspectives on a wide range of conceptual and practical issues in music education assessment, evaluation, and feedback as these apply to various forms of music education within schools and communities. The central aims of this Handbook focus on broadening and deepening readers’ understandings of and critical thinking about the problems, opportunities, spaces and places, concepts, and practical strategies that music educators and community music facilitators employ, develop, and deploy to improve various aspects of music teaching and learning around the world.