Changing the lyrics of iconic music

This link is left over from the New Year's holidays, as reported by Rolling Stone:

Cee Lo Green upset John Lennon fans on Saturday night by performing a soulful version of the songwriter's classic "Imagine" with the lyrics changed from "nothing to kill or die for / and no religion too" to "nothing to kill or die for / and all religion's true." According to some fans, Green changed the meaning of the song by switching out the line...

Green, who sang the song on NBC's New Year's Eve broadcast from Times Square, responded to criticism about the alteration by tweeting "Yo I meant no disrespect by changing the lyric guys! I was trying to say a world were u could believe what u wanted that's all."