Bert Berns is not a household name despite writing \u201cPiece of My Heart\u201d, \u201cHang On Sloopy\u201d, \u201cBrown Eyed Girl\u201d, \u201cTwist & Shout\u201d and \u201cHere Comes the Night\u201d. His son, who never knew, him tells the Bert Burns story in a doc and upcoming broadway musical.