This is a pretty decent cover of the song "Glad," which is from Traffic's "John Barleycorn Must Die" album. Of course it'll never be the same as the original, but that's to be expected.
The drummer is Butch Trucks, former Allman Brothers Band drummer. The bassist is Berry Oakley, Jr.—the son of the Allman Brothers Band’s founding bassist. I'm not sure who the keyboardist is, but it may be former Greg Allman band member Bruce Katz. I don't know him by sight, or even by sound, since I was never a big Greg Allman fan.
Butch Trucks & The Freight Train Band with "Glad."