The Piano Keys Teacher Combo Set is an excellent tool to introduce piano to beginners of all ages. This method is easy to understand, even children as young as three years old enjoying using this product. Includes: Unit that fits behind keys, Song & Theory Book 1, and the Music Note Teacher. My kids love this so much! I can’t keep them off the piano! Yippee! Teaches: names of keys on the piano keyboard, connection between the keys on the piano and the location of notes on the Grand Staff, concept of octaves, piano finger numbers as it relates to correct hand position on the piano keyboard, and more!