I've got a 7 stringer but mt guitar tutor is teaching me the basics (i.e. 6 string guitar). Now, my problem is here:- I've got a book about 7 string guitars. When I compared the Cmajor7 on this book and the Cmajor7 on my tutition's book... weirdly they are different! Thus, I ended up totally crazy and confused ... Can someone help me?!