I'm pretty sure that the fifth line is "That no one knows" rather than "And no one knows". This would fit the interpretation that he's talking about getting away from his previous celebrity-style life in order to record a more authentic album, since it means that it's a song that know one knows; i.e. he's still working on it and it's at the stage where no one else has ever heard it.
I'm pretty sure that the fifth line is "That no one knows" rather than "And no one knows". This would fit the interpretation that he's talking about getting away from his previous celebrity-style life in order to record a more authentic album, since it means that it's a song that know one knows; i.e. he's still working on it and it's at the stage where no one else has ever heard it.