In your own space, share a favorite piece of original canon (a TV episode, a song, a favorite interview, a book, a scene from a movie, etc) and explain why you love it so much. Leave a comment in this post saying you did it. Include a link to your post if you feel comfortable doing so.
I could wax poetic about my favorite Doctor Who episodes - "Human Nature"/"Family of Blood", of course, or "Midnight", or "The Caves of Androzani", or "The Ark in Space" - but I could do that any day (and just might, without warning!). I could also talk about audios, but you've probably already heard me gush about "Peri and the Piscon Paradox", "The Chimes of Midnight", and "The Kingmaker". So, let's try something different.
My favorite Murray Gold composition, other than the Series 2 version of the Doctor Who main theme, is "The Doctor Forever". Not a common choice, I know; most people love "The Doctor's Theme" or "I Am the Doctor". Certainly nothing is as memorable as "I Am the Doctor", but then that might be because they really kind of beat that song into the ground during Eleven's run.
"The Doctor Forever" consists of two parts. The first part begins with a soprano solo, a slow aria similar to the one in "The Doctor's Theme" which is then repeated by the rest of the orchestra. This is often played during scenes in which the Tenth Doctor is sad. (Cue joke about it playing constantly throughout his whole run...) Then, then second part is an action piece, normally played when the Doctor is running to save the day. One notable instance of this is in "Gridlock", when the Doctor finally decides it's time to take action and starts jumping from car to car: the music played then is the second half of "The Doctor Forever".
The beauty of the piece is that both parts - the aria and the action - are the same melody, interpreted for different purposes; in other words, it's the same Doctor, but in different situations. The piece is specific to the Tenth Doctor, which is unusual (even "I Am the Doctor" is not originally from Eleven's run - it debuted in series 4), and it feels very Ten - more symphonic and lacking the (very appropriate) jazzy feel of Eleven's music.