Workbook on the Fundamentals of Music Theory - For Instrumental, Theory, and Group Lessons - Suitable for Ages 10 and Up - From Notation to Accidentals - Practice-Oriented Exercises and Games - Includes Ear Training Tasks - Small, Building Units - Flexible Use. 'Music Detectives' is a valuable source of ideas for creative music teachers and is well-suited as teaching material in theory or ear training classes, as well as a supplement in instrumental lessons. Kristin Thielemann, üben & musizieren 1/13, states: "Spegg demonstrates his teaching skills particularly in the section on intervals, (...) explaining the fundamentals so clearly and spicing it up with fun game ideas that these pages should be mandatory for every music student." Uta Hussong, Musik & Bildung 2/13, adds: "Instrumental teachers can rejoice: a useful workbook for children aged 10 and up has finally hit the market!".