The legendary British reggae band UB40 is coming to town—one version of it is, anyway. Bands evolve and change over time, but UB40 is a more unusual case because there currently exist two separate lineups, both including original members and both claiming to be the real thing. The band coming to New Orleans has four originals—guitarist Robin Campbell, bassist Earl Falconer, drummer Jimmy Brown, and trombonist Norman Hassan—while the other two surviving originals...