It was Back to the Future at Fenway Park Saturday night, as three of the 1980s' most beloved rock 'n' roll bands filled the venerable ballpark with 35,000 or so giddy fans. Marty McFly was not sighted, but pretty much everyone else who was anyone on the rock charts in the '80s was on hand.The official lineup featured co-headliners Journey and Def Leppard, with special guests Cheap Trick, and if that seems like an odd trio in theory, in practice it made for a fairly seamless night [...]