GT What is it about guitar instrumentals that appeals to you?
KM: Instrumentals in general allow the composer to take the listener on a slightly different journey than with vocals. With bands like Rush, Yes or most of the prog bands, the arrangements allow for the vocal and instrumental sections to work together to keep the interest of the listener strong. When writing an entirely instrumental piece, the composer needs to work hard to create something that keeps the listener involved without the aid of a voice or song. That is quite a challenge. Vai And Satch are the obvious masters when it comes to rock. Metheny is on another planet. Check out the YouTube Steve Vai Attitude Song performances. Now that's how to keep your audience hooked!
GT: What can an instrumental provide a listener that a vocal song can't?
KM: As above, a totally different journey.