The Max Weinberg 7, Conan O’Brien’s house band, has become far more interesting since Max Weinberg has taken leave of the band. Weinberg, as you may know, is out on tour with the E Street Band, in support of Bruce Springsteen. This observation about interest has nothing to do with the interim leadership of guitarist Jimmy Vivino—though this is not to reduce the capability of that musician. Rather, it has to do with the entire notion of an outfit whose existence seems to be predicated on an individual. In this case, Max Weinberg.