Apparently it was all fun and games during the end of the David Tennant era on Doctor Who. Not only was there a Proclaimers "500 Miles" song, but during the cast party wrap special, Tennant, John Barrowman and Catherine Tate thanked Russell T Davies and Julie Garner in the most musical of ways.
Both showrunners were moving on to other projects, so the best way to congratulate them on such great work seemed to be a "Let's Do It" Victoria Wood-style sketch. (The song, "A Ballad to Russell & Julie," was written by Jennie Fava.)
The last couple of crazy music videos coming from the Tennant tenure of Doctor Who make us wonder if there'll ever be a Doctor Who musical in the future. Given Spider-Man is on Broadway, you never know.