‘Sad music’ implies no less complex social relations music mediates than music itself. It becomes, therefore, political matter. Blues, representing African American ethnic and emotional identity, has acquired some universal meanings in musical communications during the 20th century. This cultural process suggests points of view from which we can explore the meanings of ‘sad music’ in the field of popular music. In the latter part of this paper, I will relate the term ‘blues’ not only to African Americans but also to the emotional community of Koreans as non-Westerners, and make an attempt at expanding its implication to the postcolonial levels. In this sense, I define blues as a culturological mechanism in the era of mass media, representing the ‘alienated tone’ deviated from the stable(Westernized) tonal order in the pre-existing convention of listening, and the memories of loss it implies, and its related emotion of sadness, in the context of identity politics.