Bests & Worsts Reviews from Amazon

There are a few different versions of this songbook, and unfortunately the reviews seem to be confusing as some people said it was very easy while others said it is extremely difficult. Some reviews are even for the soundtrack CD! How do you know which one you're getting, when all the reviews are lumped together??? I wanted to make sure I was getting a version for my child was neither too easy nor too difficult. I did a little research on Sheet Music Plus. Just make sure to check the ISBN number on the version you are ordering off Amazon. Here are the descriptions: ISBN 0634029827 Piano/Keyboard - SMP Primer Level (Early Elementary) Very beginning music. Five-finger positions with no chords and almost no hand position movement. This book has duet part for the teacher. ISBN 0634029800 Piano/Keyboard - SMP Level 4 (Intermediate) Introduction of 4-note chords and sixteenth notes. Hand movement covering 2 to 3 octaves. ISBN 0634029797 Piano/Keyboard - SMP Level 7 (Late Intermediate) 4 to 5-note chords in both hands and scales in octaves in both hands.