It is a similar move to Andy Parfitt's last June, when he was promoted from Radio 1 controller to lead youth programming across the BBC's output.
Douglas will be a central point of contact for the music community and will work closely with: Parfitt; Roger Wright, coordinator of classical music; Adam Kemp, arts and music commissioner for television; Peter Maniura, head of classical music TV; and Mark Cooper, creative head of TV music entertainment.
Douglas said: "We need to ensure that we stay ahead of the game, capitalising on creative opportunities and working even more closely with the music community as a whole to leverage the full strength of the BBC."