Here's a video starring the cast of Doctor Who (well, Karen Gillan, Matt Smith and Arthur Darvill) singing at a piano with a mysterious child. The child's name is apparently Jamie and they're singing the Doctor Who Confidential theme tune if that's any help.

Anyway, what is interesting is that Karen is a terrible singer. Really, truly bad. Conversely, Matt doesn't seem that bad at the piano. Perhaps that was what initially enticed Daisy Lowe, the fact that he's a bit of a pianist.