Jason Mraz started off 2012 with a new song called "I Won't Give Up." Part of his upcoming album, the heartfelt ballad is right up Mr. A-Z's alley. Days after he released the lyric video, YouTube star and recording artist Christina Grimmie posted her own piano-aided cover, which Jason loved! He even tweeted about it and called her a "siren."
Watch the videos below and vote for your favorite version! Don’t you think they'd sound great together?