For those who would like to read up on all of the versions available (and of various demos that haven't seen the light of day), this is a great 'Bible' to use for reference
https://queenvault.com/For those interested in concert set lists, rare pics, bootlegs, etc., these two are the best
https://www.queenlive.ca and
https://www.queenconcerts.com/Two brief comments: Hammersmith '75 was one of the most bootlegged concerts. Thanks to friends, I've had video of this for five years, which also includes the audio of the encore of 'Seven Seas of Rhye', 'See What A Fool I've Been' GSTQ. These tracks are available on the 'A Night at the Odeon' CD, but not the DVD. Seems the film crew thought the concert was over, and closed up shop. A shame that Queen Productions used yet another cheap Photoshop effort for the sleeve. See 'Queen Rocks Montreal'.
With the holidays approaching, 'Thank God It's Christmas' (on GH III as well as the 'Queen Collection') and 'A Winter's Tale' make for great BTB tracks on any compilation at this time of year.
(I do know a thing or three about the band, and have enjoyed catching up on this thread)