Before Dream Theater took off I used to teach a lot, and one of the things my students often asked me was how to apply the chromatic scale to practical playing situations. You see, their other teachers would give them chromatic warm-up exercises without providing any explanation of how important and versatile this scale actually is.
Seeing Rush the first time was huge for me. That was my favorite band and I couldn't believe they were actually in the same building as me. I was totally freaking out when the show started and when they started to play it was almost like cartoon characters coming to life. I couldn't get my head around the fact that it was really them.
The guitar is a funny instrument because you have bendable strings and distortion - there's a potential for noise. It is more exposing. Actually controlling the instrument, using proper vibrato, bending notes in tune, not fretting too hard, controlling the noise is a skill in itself that takes many years.