History and criticism 143 Music 134 History 85 MUSIC 44 Librettos 41 Ballad operas 39 Criticism and interpretation 37 General 34 Folk music 27 Folk songs, English 27 Church music 23 Popular music 22 Social aspects 22 Instruction and study 21 African Americans 18 Hymns, English 18 Composers 16 Folklore 15 Instruction & Study 15 BIOGRAPHY & AUTOBIOGRAPHY 13 Ballads, English 13 Folk songs 13 Folk-songs, American 13 Genres & Styles 13 Philosophy and aesthetics 13 Political aspects 13 Women 13 Music theory 12 Reference 12 Social life and customs 12