This is a great song and I have downloaded several copies.  It has been done by practically everybody from rock bands to opera singers and there is something to say for all.  The lyrics are stunning - it is a very sad love song.  The singer or chorus who does it needs quite a range.  It needs to be belted out, not whispered with the help of electronic equipment.  I liked Allison Crowe's renditon.  Bon Jovi does a good job, as does Jason Castro,the Canadian Tenors, and Brandi Carlile.