Originally Posted by: mrsoul55I'm looking for some books on music theory. I've noticed amazon has some specifically for guitar around fretboard theory. Are there any you all can recommend?[/quote]
First & foremost, I've never seen one book that covers it all. Writing one myself is a long term goal. :) However, for fretboard theory & practice, this book is fairly comprehensive & has lots of practical applications.

http://www.amazon.com/Hal-Leonard-Fretboard-Mastery-Book/dp/0793597897
[QUOTE=mrsoul55] I'm basically a beginner guitarist but want to understand about the different scales and modes and other theory related items. Are there any single books that are comprehensive in their discussion of theory?

Since you have access to GT, start here with my tutorials covering a lot of this material. The first four chapters in GF2 are essentially a primer in music theory for guitar.

www.guitartricks.com/course.php?input=2

Start at the beginning with intervals then you'll gradually work through the very basics in intervals, scales, triads & how chords & scales are related to each other.

Or if you are beyond that, then check out these more advanced tutorials to get more in depth.

Music Theory Overview
http://www.guitartricks.com/tutorial.php?input=495

Circle Of Fifths
http://www.guitartricks.com/tutorial.php?input=835

Modes
http://www.guitartricks.com/tutorial.php?input=370

Practicing Modes
http://www.guitartricks.com/tutorial.php?input=770

Always remember, the most important thing about theory is how you apply it.

If you've seen those & want more, just let me know. I can point you to tons of other GT tutorials that will also show you more about how to learn theory and apply it to rock guitar playing. Ask more if necessary & have fun with it!