Just an observation, but as someone who plays guitar (a bit) I don't think you can pigeonhole it really. Guitars feature heavily in most genre, but when you say "guitar music" most people tend to think rock/indie/punk/metal. Don't get me wrong, I love that stuff, but I also really like soul, Motown, old school R&B and disco. They're all guitar heavy but wouldn't be classed as "guitar" music. Odd really.