I doubt anyone will get this, but thought I'd throw it in anyway - sticking with the numbers/Vangelis and his musical partners theme, in 1973 I was actually the 1st to do what?
No - it's more to do with the partner. I think they had given up performing together by then, and Vangelis was more into the producing side...
He was in a group Aphrodite's Child that broke up around that time, but then he did some work with Silver Koulouris and Robert Fitoussi who had both been in the band. Not sure I am getting anywhere!
You went out for a pint in Watford with Demis and Nana Miskouri and were the first people ever to be barred from the Escort Arms because of Nana's, quite frankly, filthy jokes?