Instruct: Classify the given review as either positive or negative.
Query: Guitar not in tune!!

OK. I just started this book, and the first thing I noticed is that Bob's guitar is out of tune. This is entirely unacceptable for a book teaching you how to play guitar. Especially slide guitar where the location of the slide above the fret is so important! I've been playing guitar for 20 years, and I play a little slide, so I was able to easily catch this horrible mistake. FYI, you need to tune your guitar down 1/4 step from the standard G or D tunings. I believe what happened is the following:Bob originally recorded this on a tape. When the tape was converted to CD, the tape played just a tiny bit slow, causing the change in tuning and sound.Once again, a horrible oversight on the publishers of this book. But, I've tuned my guitar 1/4 step down, and I'll see how the actual material is.