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Here I took the excerpt of the song in question then I raised the pitch from C to C#. It's Freddie.
If there should be a question about the vocals it should be on the song You Don't Fool Me which is noticablely Sped up making Freddies voice more nasally like he has a cold.
Which version have you got? Ive got four different versions...
The original version - The Cross (with Freddie vocals)
Queen GH III version - Roger,Brian and Freddie
Heaven For Everyone (Moonshine Mix)- The Cross (with Freddie )... Duet with Freddie and Roger.
Live Version - The Cross
Aren't you referring to the Cross version; with the lines:
"While you are imagining, imagining for instance...
A Silence, that you can take advantage of.."
or something like that. More spoken words than real singing. Don't think this is Fred, Rog of anyone of the Cross either.