In making an investigation on the difference between Musical and Opera, the most stimulating outcome is that it makes a significant contribution to the popular culture’s knowledge of the genre called classical opera. In the modern popular culture, the terms Musical and Opera are often interchangeably used to denote any art form intermixing dramatic works and musical score. For example, Kaspar Hauser, a Musical performed at The Flea recently, was called “A Foundling’s Opera”, clearly indicating the need for a thorough awareness of the difference between Musical and Opera. As Gabe M. Wiener distinguishes, “Generally, a musical has dialogue with interspersed songs. Opera is generally sung through, the dialogue portions being replaced with recitatives (music which is intoned in a way that resembles speech).” (Wiener) Some of the most celebrated Musicals are Les Miserables, Chess, Joseph, etc. and these are also known as ‘popular operas’ or ‘rock operas’, considering the fact that they have significant similarity to ‘classical’ opera. Although these Musicals are sung through, it is not the normal case with other Musicals. It is also notable that the principal singers in musicals also perform dance, whereas it is not the practice in opera. (Wiener) Therefore, there are marked differences between Musical and Opera, although one may notice several similar elements in both these art forms.