It's a difficult song to sing for a start, especially for it's length.
As for the original notes I don't think there are many that are able to hit exactly the same notes live as they do in the studio, mainly cause live is a one take deal whereas in the studio you get a lot of chances to get it right.
Also when singing live, most singers will ask the band to take the song down about half a tone in order to hit the right notes. My singing teacher advise me of this on numerous occasions that it helps with possible the wear and tear of the voice and can also make the song come off better as well.
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