Thinking of current players who are under 50, I’ll go with Neal Casal currently of the Chris Robinson Brotherhood, and formerly with Ryan Adams’ Cardinals (he came on in 2005). He isn’t flashy, he’ll be staying within the constructs of the song, and then as many Brotherhood songs allow him to do he’ll take off into spaceland. I greatly enjoy hearing we he goes in those moments, and he’s very good at seamlessly passing over to the keyboards where sometimes I’m not exactly sure when the keyboards taking over, which sounds idiotic because they’re such different instruments. He’s not just a “spacey” player as he also has B-bender that can make him sound somewhat like Clarence White. The band draws covers from a wide range of artists (Byrds, Steppenwolf, T.Rex, VU, Hank Ballard, too many to list) and so it’s interesting to hear his approach to songs that you know well. He also was behind the “between the sets” music for the Fare Thee Well shows, which perfectly encapsulates his ability to show an influence but not carbon copy it. Oh, and he's far better than my attempt at describing his abilities.