(CNN) – Rivalry? What rivalry? Late-night talk show hosts Jay Leno and Jimmy Fallon, who've been pitted against each other as rumors fly that NBC is mulling a changing of the guard, made light of their situation Monday night, by belting a show tune together. "Tonight, tonight, who's going to host 'Tonight?' Is it going … Continue reading VIDEO: Leno, Fallon make light of rivalry by bursting into song