Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good book, but have to buy the ear training discs separately?

It wasn't clear to me that you need the ear training CD's to go with the lessons until we got several lessons into the book. I'm buying them now so we can proceed, but it would make more sense for the publisher to INCLUDE it with the workbooks since they are necessary! Silly..... Regardless, the content of the books is great so far for my 11yo, so I'm sticking it out.