By Mike Collett-White LONDON, Jan 8 (Reuters) - British singer David Bowie released his first new song in nearly a decade on Tuesday in a surprise launch coinciding with his 66th birthday. "Where Are We Now?", produced by long-term collaborator Tony Visconti, is a melancholic look back to the time Bowie spent in Berlin in the 1970s with an accompanying video featuring black-and-white footage of the city when it was still divided. />