I just picked this up and It just might be the best thing I have purchased for my bass studies. It is 400 plus pages covering 9 different chords in every key. Tab and standard notation as well as explanations. I really love Joes teaching style and that he is able to so effectively explain the concepts he is presenting. I am having a blast working through this book and I'm sure most any bass player would find it useful as well. Thanks Joe for all the great material you continue to share with your fellow bass players!!!