Accordingly, this book is a good reference for students at Grades 7 & 8. This book is entitled, Graded Music for Tuned Percussion by Kevin Hathway and Ian Wright which provides practice keys for students wanting to learn percussion instruments like a glockenspiel.
Graded Music for Tuned Percussion by Kevin Hathway and Ian Wright (image from musicroom.com)
If I remembered it right, during my younger years in education, we have had no percussion lessons which I do not want my future kids to experience. Learning music is such an enjoyable and fun thing to do.