Columbia subject headings:
Harvard subject headings:
Distrito Federal (Mexico). Sistema de Transporte Colectivo.
Music in subways--Mexico--Mexico City.
Musicians--Mexico--Mexico City.
Urban transportation--Social aspects--Mexico--Mexico City.
Princeton subject headings:
Distrito Federal (Mexico). Sistema de Transporte Colectivo
Music--Social aspects--Mexico--Mexico City.
Street music--Mexico--Mexico City.
Street musicians--Mexico--Mexico City.
Subways--Mexico--Mexico City.