Fans of the movie musical "The Sound of Music" will be interested to learn the true story of the von Trapp family singers, as remembered by Maria von Trapp herself. Maria was indeed a novice nun, but there ends her resemblance to the Julie Andrews character. Her autobiography reveals a likelier, but still crowd-pleasing, story of life in pre-Anschluss Salzburg.  (AST47, $13.99)