We had Melissa Ethridge's <i>Keep it Precious</i> for our wedding song... not jazzy or anything, just figured I'd mention. . .
My favorite Jazz/Swing era artists include Count Basie, Bix Beiderbecke and Charlie Parker - they're who I think of when I think of that type of music. Enough pizazz to keep it from being sleepy, but mellow enough to be called 'Dinner Music'.
If you want some ideas, check out
www.accuradio.com, hit the jazz channel and then go to the "Old school" subchannel.
There's album playlists in there somewhere, too, for your perusing pleasure.