From the first album onwards. All I can think of is Seven Seas of Rhye.
The song that they played for the longest was Now I'm Here, from 1974 to 1986. Seven Seas of Rhye was not played continuously for that long.
Close call for keep yourself alive and liar though.
God save the Queen, although not for the entirety
OOH! I KNOW THIS ONE!
It's Brian's solo from BLAG which became the Brighton Rock solo!
What do i win?
A trip to the loo?
I looked at concerts on www.queenconcerts.com and I will safely say Jailhouse rock was played the most from 1971 to 1985
Brian's guitar solo has been there since the Smile days (Blag).
* Actually. ...
The blag solo I'd just referred to probably wouldn't count. ....TRICK QUESTION? ??
BUT AH -HA!! I've got it.
The one song featured at every show.
TRACK 12: "YEAH"
Now I'm Here is apprently number 1 with Bohemian Rhapsody Second
https://www.setlist.fm/stats/queen-43d6e37f.html
but what about all the concerts that don't have info down yet