I've always been thinking about it but never told it.
In "The Champions" documentary there's a mix of footages of Bo Rhap from such concerts like Paris and Tokyo, both in 1979 and the audio is from Live Killers. But from which concert the very first four seconds of the footage?
When the footage just appears, we see the back of Freddie against the piano and John near him. At first I'd compared it to both Paris concerts and it didn't match with them because Freddie was in different suspenders (the silver ones on February 28 and the red ones on March 1). Then I'd compared it to the Tokyo footage and it also didn't match because again, Freddie seems to be in different suspenders. Also, Freddie had a yellow ribbon on his neck during the first half of Bo Rhap in Tokyo but he doesn't have it on that bit in "The Champions" and John seems to be in different dress.
It seems that in that bit of footage Freddie has some of the suspenders which he was wearing on the Japanese leg of the tour... so maybe it's from April 24???
"I really feel like being evil tonight."