Funk vocalist, songwriter, and producer Betty Davis was artistic and sexual liberation personified. Uncompromising, unfiltered, and ahead of its time, her small body of work consequently made little commercial impact but gradually found a wider audience. She released her first recordings as Betty Mabry in 1964, had a profound effect on Miles Davis -- to whom she was briefly married -- and is known most for her progressive left-field funk albums issued the following decade, namely her self-titled debut and the charting (and fittingly titled) They Say I'm Different and Nasty Gal...