Not something rare or haven't heard before, but some new fans would like it, probably. Bits of 'I Go Crazy' played by Brian two years before the release of the track.
This recording is from Vienna show, I guess. link
And as a bonus track - one of Russian covers of 'We Are The Champions' - it's entitled 'Laughing Champions'. You don't need to speak Russian to understand it. This track is unofficial, so no any problems. link