Green was criticized by posters on Twitter and YouTube for singing, "Nothing to kill or die for, and all religion's true," instead of Lennon's original line, "Nothing to kill or die for, and no religion, too," during his performance.
"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," the Huffington Post said Green responded by Twitter.
CBS News said Green's apology has since been removed from Twitter.
Notable deaths of 2014 [PHOTOS]