John, I find your last comment a bit bizarre to be honest.
If I understand you correctly, you seem to be surprised in some way that the Carousel piece of music is totally distinct to Brighton Rock. What were you expecting to hear on that MP3?
Wilki's version purports to be the original Carousel soundscape, and quite obviously Queen decided to use the first 25 seconds of it as an intro to Brighton Rock, fading out Carousel as they fade in their recording of Brighton Rock.
We didn't even really need to hear this standalone version of Carousel to know that that's what happened.
Or am I totally missing your point?
Gullibility and credulity are considered undesirable qualities in every department of human life -- except religion.