Edited sentence: Clapton often used his signature song as a “mystery,” playing with his audience.He admits as much on Unplugged, where he introduces it by saying, “See if you can spot this one.It is, in short, considered by many to be a masterpiece.It’s not a love song any longer, but an accusing damnation.It’s some of his finest guitar work, if not the finest, and the anger is palatable through his chords and his vocals.On what many consider the finest rendition, from the live One More Car, One More Rider (2001) Clapton begins with a fairly standard guitar solo, and then suddenly and abruptly crashes into the song at which point the audience recognizes it.That version has a much harder edge than his earlier, softer, recordings of the song.”  The intro had been reworked so many times not many knew all the versions