Tom, try the Kenny Burrell station on Pandora, it seems to suit all moods and fits into every situation. I listen to it all the time.
This is a good example of why Pandora is great. I never really listened to or cared much about jazz guitarists. Thoe that i played with and had records of never really did much for me. The instrument always sounded awkward to me, just to hard to make it sound smooth playing bop. Then I heard some soulful grooves by Burrell and created a new station from it, for cool party music, not for serious jazz listening. But the more I listened to the station, the more technically accomplished I learned Burrell really is. I finally heard his record with Trane last week, now he is one of my most interesting artists. If you use Pandora as intended, by creating new stations when you hear a new artist you like, and rating the tracks as much as you can, it really pays off in discovering new music.