But as he passed Bibbs's door he heard from within the sound of a cheerful young voice humming jubilant fragments of song: WHO looks a mustang in the eye ?... With a leap from the ground To the saddle in a bound. And away--and away! Hi-yay! It was the first time in Sheridan's life that he had ever detected any musical symptom whatever in Bibbs--he had never even heard him whistle--and it seemed the last touch of irony that the useless fool should be merry to-day. To Sheridan it was Tom o' Bedlam singing while the house burned; and he did not tarry to enjoy the melody, but went into his own room and locked the door..