When I think of Big Brother I think of the re-broadcast of 1984; probably in 1984. All I renember of the TV show that's used as a reference on Who were news items about the new phenomenon coming from the Netherlands. I can't even recall hearing the music myself.
It's interesting how the surveillance issue has become 'Big Brother', but the far more worrying thing is the way information can be controlled. Re. the music then I think you'd only know it if you watched the show. So lucky you.

I recall a lesbian was all over the gay press at the time; there was still a gay press back then. Only glossy lifestyle magazines now, but she lost; it was said, because the one who won promised to give the prize to charity - I think.
I think she came 2nd or 3rd? Can't remember much about the guy who won, except that his name was Craig and he was sort of very average. The lesbian former nun was probably a little too out there, but it was good that they had her on the show, I think.

That really is all I remember; whereas the black & white images of the BBC re-broadcast of it's production of 1984 are still strong enough to evoke emotions even now.
I don't think I have ever watched it. But I have read the book.