A conductor is a person who directs the performance of a composer's score. In this pursuit, they will be most concerned with determining when individual instruments play their parts of the music. Often, but not always, the conductor will also be the orchestrator of the orchestra.
Marcus Dods was the only conductor so credited on the 1963 version of Doctor Who, for his work on The Aztecs. Nonetheless, some others received the specific credit of "Incidental music composed and conducted by": Norman Kay on The Sensorites, Raymond Jones on The Romans, and Carey Blyton on Doctor Who and the Silurians.
In BBC Wales Doctor Who, conductors were at first only credited on special occasion, as with The End of Time. During the Moffat and Chibnall eras, however, the conductor began to be credited on a more regular basis. As of January 2019[update], the only individuals credited as conductors for the BBC Wales programme were Jeremy Holland-Smith, Ben Foster, David Temple, Alastair King and Alec Roberts. Most were commonly credited for "Music conducted and orchestrated by [them]".
Ben Foster was also the conductor for Doctor Who: A Celebration, the series' first live music event. He also conducted the orchestra at Doctor Who at the Proms, together with Stephen Bell in 2008, alongside Grant Llewellyn in 2010, and on his own in 2013. Geoff Alexander conducted and orchestrated for the 2013 docu-drama An Adventure in Space and Time.