If it was vocal music, the words would be in English, despite the snobs who declared English an unsingable language. In a way, it was part of the entire awakening of America that happened after the Civil War, a time in which American painters, writers and 'serious' composers addressed specifically American themes. During this period the roots of blues, gospel, jazz and country music took shape; in the 20th century, these became the core of American popular music, which further evolved into the styles like rhythm and blues, rock and roll and hip hop music.