Check out David Grisman. He started out a bluegrasser but his recordings of the last 20 years or so have been a lot of swing, Brazilian, jazz, etc.
You should be able to find all kinds of extremely cool stuff here:
www.furthurnet.org
It's a P2P file service that allows you to download performances from artists that have agreed in writing to alloow their music to be freely traded.
I've got Govt Mule, Bruce Hornsby, Jerry Garcia Band, the Dead, Phil & Friends, Counting Crows, Mississippi All-Stars shows off that site.
Most of the recordings are top-notch, too, I might add. "Bootleg" tapers are for the most part pretty anal about the recordings they post, and I've seen a lot of guys with $2-3,000 worth of mics, pres, converters, and DATs at Dead and Phil shows, and the Mule too.
I've been trying to find a recording a guy did at the Moore Theatre of the Mule last May with a matched pair of 103's. I have his version of Phil's show in Eugene from last year and it is sublime.