As a matter of course, one wants to despise records like this. Part of a legendary band reunites 20 years after its dissolution and the death of a founding member (Chris Wood) -- reminiscent of the Who, whose numerous reunions are simply despicable -- and hits the road with audio and video gear in tow for an "historic" tour. In the case of what was left of Traffic --Steve Winwood and Jim Capaldi-- this isn't the case with their 1994 reunion. Last Great Traffic Jam, a dual disc (actually a double-disc package consisting of two CDs' worth of material, a DVD of concert footage, and historical artifacts (a hodgepodge of photos and bios, etc.)), offers a document that's worth hearing. The pair hired keyboard giant Randall Bramblett,