It's the battle of the exes in this edition of Lyric Battle! In recent lyrics news, John Mayer revealed that he was hurt and upset by ex-girlfriend Taylor Swift's "Dear John" lyrics: which also happened to essentially be her Dear John letter to him! Personally, we think John Mayer should get over it (it was two years ago!), but this news makes for an excellent Lyric Battle between the two ex-lovers. We're putting Taylor's "Dear John" lyrics up against John Mayer's own duet with Taylor herself: "Half Of My Heart"! So, whose lyrics are you going to vote for?