"Friend, asshole, angel, mutant," singer-songwriter Vic Chesnutt "came along and made us gross and broken people seem . . . I dunno, cooler, I guess." A quadriplegic who could play only simple chords on his guitar, Chesnutt recorded seventeen critically acclaimed albums before his death in 2009, including About to Choke, North Star Deserter, and At the Cut. In 2006, NPR placed him in the top five of the ten best living songwriters,...