If it weren't filmed entirely using animated Lego blocks, "Piece by Piece" would be a fairly routine music documentary, in this case a profile of the protean hip-hop producer-performer Pharrell Williams.
In the hands of director Morgan Neville and guided by the voice of its self-effacing subject, "Piece by Piece" is mostly the latter. If you're unfamiliar with the backstage of hip-hop culture, you may find yourself learning quite a bit.
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