I am a huge fan of instrumental guitar music- specifically, I like skill over speed, and music that is not self serving to a guitarist wanking scales all day long (Like Malmsteen or Michael Angelo Batio). Vocals are cool, but letting the guitar tell the story is so much better.....
Here's a few on this morning's playlist (the harder stuff come later in the day...:
Travis Larson Band
Rik Emmett- former guitarist for Triumph
Michael Lee Firkins