"Hey Jude" and "Atlantis"

Factual Questions
1

My wife insists that in the late 60’s radio stations used to play the refrain from “Hey Jude” (Beatles) and “Atlantis” (Donovan) simultaneously. She thinks they were mixed in the recording studio. I suggested it was something the DJ’s put together (i.e. play both songs on two different turntables with the correct timing).

I don’t find anything about this on the web. The only connection I found was that the refrain from “Atlantis” (released in 1969) is reminiscent of that of “Hey Jude” (1968), and that Paul McCartney was one of the backup singers (in a cameo role) for “Atlantis.”

You have to admit that the “way down below the ocean…” part of “Atlantis” is very similar to the “na na na na…” part of “Hey Jude.”

So is there a further connection between these songs? Do they “mesh” together? Or is my wife nuts?

2

I am not touchin’ that last question, but as a child of the 60’s, (I grew up during the “Age of Aquariums”)I never heard of this, but it makes a kind of sense. For them to play together wouldn’t both songs have to be in the same key?

Also, wasn’t Paul the “quite rightly” voice in MELLOW YELLOW? I didn’t know he was on ATLANTIS.

Q

3

Oh my gawd, someone else has heard of this. My mom used to have a version of this (“Hey Jude”/“Atlantis”) on an 8-track, but done by one of those easy-listening groups (New Christy Minstrels or something like that). Okay, it’s not by the Beatles/Donovan, but obviously someone got and followed up with the idea.

“Way down, below the ocean
Where I wanna be
She may be.”

does mesh with

“Nah nah nah na-na-na nah” etc.