Mike Post - Aaron's Theme
This instrumental was released on a 45 (or 7") single as a B-side to the 'Hill Street Blues' main theme, which was released in 1981. It's also known as 'Aaron's Tune'. I don't have much information on this instrumental, but I don't believe that it was a theme to a TV series.
Mike Post information:
Mike Post (born Leland Michael Postil, September 29, 1944, Berkeley, California) is an American multi-Grammy and Emmy Award winning composer best known for scoring some of the most popular TV theme songs in the United States, for primetime series such as Law & Order, NYPD Blue, The Rockford Files, LA Law, Quantum Leap, Magnum, P.I., Hill Street Blues, among numerous other notable TV shows and feature films.