Keith & Matthew Strachan are the father-son duo who composed the original Who Wants to Be a Millionaire? musical scores, including the theme song from 1998 to 2007. Keith was born on January 21, 1944 and Matthew was born on December 11, 1970. A compilation of all the Strachan themes is featured on Who Wants to Be a Millionaire: The Album. A couple of the themes are also used in the Millionaire scenes of Slumdog Millionaire.