question: Who directed the film Ray Parker Jr is best known for writing and performing the theme song to?
answer: Ivan Reitman
context: Title: That Old Song
  Passage: "That Old Song" is a 1981 song recorded by American R&B vocalist and songwriter Ray Parker Jr., along with his group, Raydio.  It was the third of four single releases from their 1981 album, "A Woman Needs Love", the last Parker recorded with Raydio.  It was the second biggest hit from the album, after "A Woman Needs Love (Just Like You Do)."
  Title: You See the Trouble with Me
  Passage: "You See the Trouble with Me" is a song recorded by American soul artists Barry White and Ray Parker Jr..  It was released in February 1976 as the second single from White's album "Let the Music Play".  In its initial release, the track reached number 14 on Billboard's Black Singles chart, and number 2 in the UK.
  Title: Who Ya Gonna Call?
  Passage: "Who Ya Gonna Call?"  is the seventh episode of the first season of the American comedy-drama television series "Psych".  It was written by co-executive producers Jack Sakmar and Kerry Lenhart, and was directed by Michael Lange.  The episode originally aired on USA Network in the United States on August 18, 2006.  The installment features guest appearances by Kirsten Nelson, Sage Brocklebank, Frank Whaley, and Nico McEown among others.  The title refers to the song "Ghostbusters", written and performed by Ray Parker Jr.
  Title: Ray Parker Jr.
  Passage: Ray Erskine Parker Jr. (born May 1, 1954) is an American guitarist, singer-songwriter,  record producer, and actor, best known for writing and performing the theme song to the movie "Ghostbusters", for his solo music, and for performing with his band, Raydio, and with Barry White.
  Title: Ghostbusters
  Passage: Ghostbusters is a 1984 American supernatural comedy film directed and produced by Ivan Reitman and written by Dan Aykroyd and Harold Ramis.  The film stars Bill Murray, Aykroyd and Ramis as eccentric parapsychologists who start a ghost-catching business in New York City.  Sigourney Weaver and Rick Moranis co-star as a client and her neighbor, and Ernie Hudson as the Ghostbusters' first recruit.
citations: Ghostbusters Ray Parker Jr.