So, I've been thinking about diving into the world of 8's for a bit now, and I've read tons of threads where people ask if they should buy an 8 or a 7 string. Lots of people tend to reply with "7's are just guitars with an extra string, but 8's are entirely different". I've seen that on multiple boards now, and was wondering if anyone could explain what people mean by that. Surly 8 strings is just one more than 7...right? tl;dr: Why do some think 8's are a totally different instrument?