When the Drive-by Truckers rolled into the 9:30 Club on July 15, 2006, it was the closest I’ve ever come to actually losing consciousness at a rock show. The gig was beyond sold-out, more vacuum-packed with sweaty bodies than any other supposedly sold-out 9:30 show I can remember. On top of that, the show fell on one of those spongy, airless summer nights that that can make the period between Independence Day and Labor…