Malik Bendjelloul's 2012 story of finding a forgotten Detroit musician living in obscurity while he was a superstar in apartheid South Africa. Won Best Documentary Oscar.
From Wikipedia
Searching for Sugar Man is a 2012 documentary film, written and directed by Malik Bendjelloul, which details the efforts in the late 1990s of two Cape Town fans, Stephen "Sugar" Segerman and Craig Bartholomew Strydom, to find out whether the rumoured death of 1970s Mexican-American musician Sixto Rodriguez was true and, if not, to learn what had become of him. Rodriguez's music, which had never achieved success in his home country of the United States, had become very popular in South Africa, although little was known about him there.