""What Happened," (...) traces Simone's life from her early childhood as a piano prodigy named Eunice Waymon to her troubled years - mentally, physically, spiritually - and finally her later return to glory ... Like a lot of documentarians, Ms. Garbus lets her choices speak for her, and she occasionally errs, both in some of her sight-and-sound juxtapositions and by folding in too much of Simone's ex-husband, Andrew Stroud ... What's missing are dialectics".