Celebrity American Idol

So my uncle and I were having a conversation about American Idol if there were a celebrity version and who would be in it. Now the rules are simple-1) They can either be dead or alive 2)They cannot be a collective or a band 3)Can be members from a band 4)Can play a musical instrument but must be able to sing. 4)Must have made an overall contribution to musical history. 5)Can be of any genre/era/etc.
Our list was narrowed down to John Lennon, Paul McCartney, Neil Young, Elvis, the two girls from Abba, Frank Sinatra, Judy Garland, Celine Dion, Tom petty, Janis Joplin, and George Harrison (I had to fight for this one, George is such a dark horse.)
Now I think that's a good list but in my personal list without my uncle they would be as follows: John Lennon, Paul McCartney, George Harrison, Bob Dylan, Elvis, Tom Petty, Roy Orbison, Buddy Holly, Judy Garland, Frank Sinatra, Janis Joplin, and Robert Plant.
Then we said that John and Paul would probably verse each other but would both lose to Elivs.
He also asked me to pick between John and Paul and I said George. Lol. I like to go to him with this question but I did come to a conclusion. I think I would say John just because of the song "Imagine" because it is so widely known and loved. Yeah Paul is great in his own right and has songs that are just as big as "Imagine" but that was my criteria. I think John and Paul would tie.
The other ones up for consideration for our "celebrity" American Idol were Joni Mitchell, Emmylou Harris, Steve Perry from Journey, Jim Morrison(My uncle said he was too out there), Neil Diamond(too Jewish-I actually had to laugh), Mick Jagger(too sexual-lol), Roger Daltrey(Not good enough to make it past the first round, ouch), Brian Wilson, Eric Clapton(more of a guitar god and not a singer-actually agreed),Ray Charles, and Stevie Wonder.
All in all, it was a weird conversation and I want to write into Fox to suggest a celebrity American Idol but I know that many of these people are already huge stars and really don't need that show.
We literally talked about it for 3 hours! It was quite the debate.