I love Tuck and Patti ... but I gotta listen to George now you have recommended him. Norman Brown is another artist I have been listening to recently. Such a great guitarist.
And Al Jarreau is another favorite. Some time ago I went to a restaurant to hear my favorite local LA jazz piano musician Freddie Ravel ( http://www.youtube.com/watch?v=_RtAhsh-Uvo and http://www.youtube.com/watch?v=hJ79JlD1xlQ&feature=related ) play. During this restaurant set he announced he had a friend present celebrating a birthday and invited him up to sing. Al Jarreau stepped up to the microphone and sang two songs with the band. Total magic !!!!!! Later as I was leaving I passed Al in the hallway and thanked him. Al shook my hand and laughed saying "just singing on my birthday". Prior to this Freddie was actually Al's musical director and backing on his European tour. Freddie was also musical director for "Earth Wind And Fire" so he has some awesome qualifications. Not to mention being a very talented piano player and composer.

The other cool thing about seeing Freddie play his restaurant gigs was the people he had playing with him in his band. Between sets I would chat with them. His guitarist was Michael O'Neill who had also been George Benson's co-guitarist for 25 years. His drummer at the time was Walfredo Reyes who was touring with Santana at that time. His bass player was Alphonso Johnson from Weather Report before Jaco .... it really was SOME restaurant band. And they would play right in front of my table as I ate dinner. As you could imagine I ate dinner there often whenever I knew they they were playing. It really was musical heaven.