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Season 1 (Season 14) Episode 2 "The Devil's Chord"
(sh.itjust.works)
A good old fashioned Doctor Who Community
Alright, music nerds, help me out: what was the 'lost chord'? It wasn't the one Paul described in the canteen scene!
EDIT: It also wasn't the Hard Day's Night chord, or the A Day in the Life (which is just E Major, anyway) chord, which would be the obvious ones.
@frankPodmore @Trekman10
Well, I heard that there was a secret chord but Russell T. Davis couldn't clear it through Leonard Cohen's estate and it displeased the Lord.
You see it goes like this, the fourth, the fifth. The minor fall, the major lift.
I think Paul was describing a melody. The chord was a tritone.
Edit: No, I was incorrect. I have no clue.