June 4, 2014 - submitted by Sebastian, Ecuador

Q. Dear Oracle! Can you tell me what's the name of the hidden song in O?

The Oracle replies:

I know a few people have been confused by this - me included! The track listing goes from A Sky Full Of Stars to O yet in between is the beautiful Fly On. It's not hidden per se, it's just not been detached from O. I think it's part of it hence the fact it's usually written O / Fly On or O (Fly On).