Hi Joybell, As you say there was a C part as well, and probably some words to it but I don't recall them. These words fit the B part although you do have to be a bit 'flexible' I think, is the phrase.
This started out as a rather pleasant tune played as an organ solo, to which someone in the '50s (Keynotes? Tony Hatch?) then wrote words.
They used to do this a lot!
As you say, forgetting the rubbish is the problem, I find unwanted songs popping out of the i-Pod I call a brain all the time , and Sheila says 'What on earth made you think of that?'. Er, dunno!

FC