I'm not up with todays music and i honestly can't name you one Ed Sheeran track because I don't listen to mainstream radio or watch pop music on a sky. I know bad manners and I've been to see them once and I vaguely recall that track but like I say it's not popular track.
I think for an older song to really catch on it's got to be a really well known song from a big band, or silo artist, not always a case though.
Back in the days a football specials the train with hundreds of boozy blues onboard was a place where several of our songs started off. Everyone is drinking and singing a City song most blues knew. The song would die down for a period of talking and laughing and whatever else and some brave bright spark what stand up to try and get a new song goin Sometimes made up ad-lib on the spot or wrote down on the fag packet or whatever. If the lyrics and the song caught on it was only a matter of time before 5 or 6 carriages were getting the words and joining in. That doesn't happen anymore, and one reason why fans don't know songs when they first gets ride in the stadium.
You make some really good points mate. About a decade ago it was the routine to meet up with old mates in town before and sometimes after matches. We were all into the same music and we would have probably got something like this going. Sadly, most of them have stopped going regularly if at all and I'm usually straight to and from the match. If you sing in the pubs in the City it usually attracts a bollocking and if you try and start something you've thought of on the concourse people look at you like your mental.
I've just pissed on my own dreams.