Betty Davis is probably better known for being Miles Davis’s wife and for her wild garb on the cover of her album They Say I’m Different than for her libidinous funk opuses and sublimely raunchy singing. Phil Cox’s low-budget documentary, Betty: They Say I’m Different, strives over its too-brief 53 minutes to build a case for its subject's canonization, although the dearth of live footage of Davis and her stellar bands hinders things. That said, Betty is crucial to any fan who desires a deeper understanding of this pioneering female funk auteur who, among other things, played a large role in changing Miles Davis’s sartorial and musical directions—even as she endured his abusive behavior. by Dave Segal