I like the way they did Jailhouse Rock, I don`t like that song but at least their version was worth listening, I think a studio version would have been nice, with piano parts (in a Don`t Stop Me kind of way), some harmonies and multi-tracked guitars. That leds me to think of another one: Saturday Night`s Alright For Fighting. I like so much the The Who version, I think Queen would have done it great as well, more or less as they did it live, with piano and Roger+Freddie singing, then in the studio they could add a kick-in solo.
Man From Manhattan would be great in a full-Queen version. I like Eddie Howell`s voice a lot, Freddie`s version wouldn`t be better but wouldn`t be worse either, just different, and the world would be mroe privileged if the two versions existed :)
Apart from those, I think some Beatles covers would be a lot of fun (`Because` with the three of them singing and Freddie playing harpsichord), and maybe some Abba songs, like That`s Me or SOS. I mean imho nobody can hold a candle to the voices of Frida&Agnetta, they were just pure magic (and so hot too), but a Queen version of those would be, again, quite cracking as well.
Following the Barcelona project, I always have wondered how far they could have taken some classical + rock combination, in a Was It All Worth It kind of way. It`d be nice if they did some kind of "game", like starting off with that Mozart Concerto (I don`t know the exact name, that one very famous...) and then all of a sudden changed to Rock Me Amadeus.
Oh, and Pink Floyd`s Money would be great in a Queen-esque way. Again not better, not worse, just different. Instead of choir singers we would have Roger & Brian, or Freddie & Brian (I think Roger`s voice would suit it better as lead), there wouln`t be sax or organ solo but instead we would have some piano parts and a delicious Deaky bass impromptu. The whole version would be, imo, more rocker than the Pink Floyd one, and less bluesy. Worth listening. Having said that, I think Run Like Hell would be perfect, Roger & Fred doing duet singing in a similar way they did in Action. It would be work way with all the delayed guitar, as a surprise after Brighton Rock solo.
John hated Hot Space. Fred's favourite singer was not Paul Rodgers. Roger didn't compose 'Innuendo.' Witness testimonies are often inaccurate. Wales is not in England. 'Bo Rhap' hasn't got 180 voices.