This is a really good book and I have learnt a lot from it. It is exactly what is was looking for as it covers all the basics you will need to understand music theory and all though it does explain musical notation and incorporates it into quite a few of the exercises, it doesn't concentrate too much on this, which is good because quite frankly it's not really needed to play the guitar (there's a difference between understanding music theory and being able to sight-read musical notation). The only complaint I have is that it is just full of small and annoying sloppy litle errors which could have easily been picked up if it had been properly proof-read. I'll list a few of the errors I've encountered (so far, that is, as I'm only half way through it):
Page 35, Fig. 1B = It states that the major scale harmonised in 3rds is Major-Minor-Minor-Major--MINOR--Minor-Minor-Major, when in fact it should be Major-Minor-Minor-Major--MAJOR--Minor-Minor-Major (don't worry you will learn what I am talking about from the book).
Page 51, just above Fig. 7 it explains that the formula for the minor scale harmonised in sevenths is i7-iim7b5-etc. when in fact it should be i7-ii7b5-etc. It may seem like I'm splitting hairs somewhat but it becomes confusing especially if you are learning and especially since in the section on harmonising the major scale the formula includes ii7b5 and you could fail to see that the major and minor scales harmonised in sevenths both contain ii7b5 as opposed to ii7b5 and iim7b5 as it actually states.
Page 59, Fig. 14 it states that Am7 is the iv7 chord of C major, which is wrong, it should have been vi7.
Like I said it may seem as though I'm splitting hairs a bit but when you're learning you need all the information contained in the study material to be 100% correct as you obviously aren't in a position (knowledge-wise) to judge whether or not it is. Discovering inconsistencies also undermines your belief that what you are reading is true.
However, it is still a good book. The publishers just need to get their act together, stop being so lazy and get someone to proof read it! Maybe for the next edition.