Man City boo because they have something to be pissed off at - we have never been in the Champions League and nothing to boo about so why would we? Sure it is run by self indulgent twats but then so is the Premier League so until we do, lets just invent new lyrics to the theme and sing that.
It's Zadok the Priest (or an arrangement of it), one of the greatest pieces of music ever written! Come on, I'll be going berserk when it's playing at the KP!
I think but not sure of the reason. My thought is, Man city had the number of players allowed in the champtions league cut due to FFP