History and criticism 40 Music 28 Composers 14 Instruction and study 13 Jazz 10 History 9 Jazz musicians 8 Criticism and interpretation 7 Popular music 7 Social aspects 6 Psychological aspects 5 Singing 5 Philosophy and aesthetics 4 Political aspects 4 Rock music 4 Choral singing 3 Country music 3 Jews 3 Vocational guidance 3 African Americans 2 Analysis, appreciation 2 Choral conducting 2 Ethnomusicology 2 Fieldwork 2 Motion picture music 2 Musical analysis 2 Musicians 2 National socialism and music 2 Romanies 2 Voice culture 2