"Arr, belay that me beauty," the Doctor exclaimed, with a rather comically alarmed expression that clearly conveyed what he was actually trying to say, which was 'no, no no no, please no Gilbert and Sullivan.' "Ye never know what ye might be startin,' on a day so fair cursed as the likes 'o this one."

The Master wasn't exactly the very model of a modern major general, and the Doctor really didn't want him to sing about it. In the end it would be more traumatizing than it would be funny.