Faul sang the song "The Fool On The Hill", recorded on September 25-27 and October 20, 1967 for the Magical Mystery Tour album, released in late November, 1967. Ever wonder who Faul was singing about? I'm guessing our Paul.
For audio examples of Paul "doing accents", listen to:
1.) https://www.youtube.com/watch?v=782X8OE4AEA where you can hear a 23-second clip of Paul in 1964 greeting the New York disc jockey Murray the K with a black man's accent.
2.) https://www.youtube.com/watch?v=ZR1OMA61FL0 with Paul doing a hilarious mocking of their song, "That Means A Lot". The Beatles tried to record the song on February 20 and March 30, 1965 and in the March 30th. session, Paul started singing the song with a heavy Liverpool accent and then shifted to singing it (deliberately, of course) off-key.
3.) Another audio excerpt is from what came to be known as Paul's Christmas Album--an acetate recording Paul put together in late 1965 as a gift to his bandmates. Listen to a short clip of Paul doing an impressive American disc jockey accent at: http://www.thebeatlesrarity.com/2015/12/24/asknat-concerning-paul-mccartneys-christmas-album .
For printed proof of Paul's talent for imitation I found:
1.) The Los Angeles radio station KRLA's fan magazine of the 1960's KRLA BEAT interview of Paul by Derek Taylor. Taylor had been the public relations manager for The Beatles and in 1965 was an independent PR agent. The interview was published April 21, 1965:
Derek: I think it's often surprising that with a face like yours . . . sort of angelic face . . . the face of a delinquent choir boy, someone once said . . that you have actually got many voices. One of them you might call a "colored voice." That was your "colored voice" in "She's A Women", wasn't it?
Paul: No, it was my green voice.
Derek: What would you call your anti-lovely voice?
Paul: I don't know . . soppy, I suppose.
Derek: Away from song-writing since you're now actors . . .
Paul: Me James Cagney one, isn't it?
Derek: Yeah, he's playing a James Cagney face, which isn't recording too well on tape. Could you give us a James Cagney line?
Paul: No, I'm afraid not.
Derek: Would you do us a quick imitation of any of your friends?
Paul: Any of my friends? I couldn't, really. I'm not very good on imitations.
Derek: You don't like being prompted to do it.
Paul: You're right.
2.) And then there's the Maureen Cleave interview published in the Evening Standard, March 25, 1966 where she described Paul as a ". . . terrible tease, an excellent mimic."
My point? Faul claimed that he wrote "The Fool On The Hill" about a Mahareshi Mahesh Yogi-like person--apropos the Beatles visiting the Indian guru in 1967 in Bangor, Wales.
Sounds possible except that the Magical Mystery Tour album that contained "The Fool On The Hill" track had a booklet accompanying it that had a drawing of Paul beneath the words "Fool On The Hill" and the last letter of the title touches--or is meant to split-- Paul's head. (See image below.)
Remember the lyrics:
Well on the way
Head in the cloud
The man of a thousand voices
Talking perfectly loud.
The lyrics suggest a man--who is not traveling alone in a vehicle--[someone heard him talking], is close to getting home and--when you add in the song's current descriptions of him--had some sort of life-changing experience.
But also implies that--as of the recording of the song in 1967--the person was still alive.