Our friends over at OrangeMercury have uncovered a treasure-trove of, as it reads, demos, out-takes and rare stuff from the one and only original Queen, circa 1974 ? 1991, comprising just under 100 tracks, spread out over five discs.

http://orangemercury.blogspot.com/2008/08/queen-olympic-sized-surprise-freddie.html#links

Editor: I guess this is a bootleg?