Columbia subject headings:
Barcelona (Spain)--Social life and customs--20th century.
Music-halls--Spain--Barcelona.
Popular music--Spain--Barcelona--History and criticism.
Zeleste (Concert hall : Barcelona, Spain)
Harvard subject headings:
Music--Spain--20th century--History and criticism.
Progressive rock music--Spain--Barcelona--History and criticism.
Rock music--Spain--Barcelona--History and criticism.
Princeton subject headings: