Jackson and Mercury worked together in the 1980s on a number of tracks that have never been heard officially by the public.
May revealed the existence of the songs last week, saying: “He [Jackson] used to come and see us when we were on tour in the States.
“He and Freddie became close friends, close enough to record a couple of tracks together at Michael’s house, tracks which have never seen the light of day.”
But May has been left incensed after two tunes by the pair, State Of Shock and There Must Be More To Life Than This, ended up on YouTube.
May fumed: “The music thieves at work as usual.”