I have an extremely eclectic taste in music but there is one song that I just can't help to love even thougn it's one of the most mellow songs you could imagine.
Sarah McLachlan - Angel
Live version -
http://www.youtube.com/watch?v=7CbAjj80NIM
Album version -
http://www.youtube.com/watch?v=ho3xjWVPT0M