A People’s History… chronicles what happened when now-defunct D.C.-based experimental punk band The Dismemberment Plan set its tracks free on the Internet to be remixed by friends and fans. Lead singer Travis Morrison’s confessional twang dominates the versions-and his voice is an acquired taste-but musically the record veers madly between skittering downtempo, loping funk-flavored electronics, digital hardcore-esque smash ‘n’ grab, and straight-up folk. The compilation is a mixed bag, but the best tracks