operetta: a short amusing opera
expressive style: a way of expressing something (in language or art or music etc.) that is characteristic of a particular person or group of people or period
lamaze method of childbirth: a method that prepares a mother for natural childbirth; the pregnant woman (in classes and at home) practices (usually with the help of a coach) and learns about the physiology of childbirth and techniques of relaxation, concentration, and breathing