The Fog of War
When researching Candy Jernigan I kept coming across "the glass wives". At the time, it didn't occur to me that they were speaking of the Philip Glass. He's an American prolific composer dipping his toes in a wide variety of waters: Sesame Street, documentaries, comic/action films, dramas, aka everything. Never knew too much about his personal life but I found it very interesting when I made the connection.
He is definitely very much a part of the filmmaking process and history.