Stevie Wonder was a musician. He travelled with the Doctor to 1814 where he performed for River Song at the frost fair of that year. (TV: A Good Man Goes to War) When he pointed out to the Doctor that he could play all the instruments, but not at once, the Doctor assembled a band of five Stevie Wonders from different points in his career, who performed "Happy Birthday" for River. (PROSE: Loose Ends 3: The Regency) While River believed Wonder was unaware he had travelled in time (TV: A Good Man Goes to War) he had actually had multiple adventures with the Doctor. (PROSE: Loose Ends 3: The Regency)