Martin Ashley 
Singing in the Lower Secondary School [PDF ebook] 

This is an essential text on an important area of the music curriculum consistently judged weak or inadequate by school inspectors in Britain. It covers social, physiological, musical, and pedagogical aspects of young adolescent singing, with focus on Key Stage 3 (ages 11-14) and the progression from primary school. Grounded in extensive research and authoritatively written, it uses case studies to illustrate best practice, and introduces the principles of cambiata, a dedicated approach to the adolescent voice. Other chapters contain practical and proven advice on repertoire, technique, and the motivation of reluctant singers, boosting the confidence of teachers for whom choral work is not the main specialism.