Six by Sondheim is an HBO television documentary which pays tribute to Broadway composer and lyricist Stephen Sondheim. The film was directed and co-produced by James Lapine, based on an idea by Frank Rich and "centers on the backstory of six great Sondheim songs."

Based on that paragraph can we conclude that this sentence is true?
Stephen Sondheim made songs exclusively depicting the racial inequality experienced by the black youth of America.
It's impossible to say