Distant Education College Jilin University Background Knowledge 2.Blues:a song sung or composed in a style originating among the American blacks,characterized typically by the use of three-line stanzas in which the words of the second line repeat the firs.The music is slow,expressing a mood of longing and melancholy. MoreBackground Knowledge Distant Education College, Jilin University 2. Blues: a song sung or composed in a style originating among the American blacks, characterized typically by the use of three-line stanzas in which the words of the second line repeat the firs. The music is slow, expressing a mood of longing and melancholy. More