Trained musicians cannot use the same breath process in daily living as for singing. Also, the normal breath cycle applied to speech is not efficient. Therefore, students who are learning to sing need to know proper breathing techniques. In this thesis, I will describe the breathing process and the correct way to breathe while singing, based on studies of four American pedagogues; Appleman, Reid, Vennard and Miller. To understand the breathing process for singing, it is necessary to study and understand the anatomical system and the mechanics of the respiratory system. Therefore, the first chapter contains anatomical system of breath management. Then, in the second chapter, the specific breath management techniques of four American pedagogues will be examined and compared. Three of them, Appelman, Vennard, and Miller, suggested some exercises in order to develop correct and efficient breathing habits.