Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Extremely nonstandard book won't help you with other music

This book has about two and a half pages about musical theory, just over two pages of the actual four easy steps, and then a bunch of music to practice. The music is written in completely nonstandard notation, which isn't well explained: about a paragraph of explanation is given about how to read the music, but otherwise you're left to figure it out for yourself. Learning to play from this notation, which is unlike any other published autoharp music I've seen, won't help you at all when you try to read and play anything else.Overall, while this method may work, I recommend against it for its lack of correlation to available sheet music.