Music Appreciation/Theory

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Opal Wheeler Books
Maestro Classics
How to Introduce Your Child to Classical Music in Fifty-Two Easy Lessons (Leslie and Robert Spencer, out of print)

The Heritage of Music (Katherine B. Shippen) Wonderful style of writing

Grade 9: 

All About The Symphony Orchestra (Ch. 3 and 4)

Grade 10:

All About The Symphony Orchestra (Ch. 5-10)

Notenrätsel
Das große Notenrätselbuch