Attempts to create a national opera in Spain repeatedly failed throughout the 19th century. Some authors have attributed this phenomenon to a deficit in the nationalization process. Others, to the contrary, have proved that there was a strong sense of Spanish national musicality from the middle of the 19th century onward. This article tries to explain this paradox underlining some essential elements that are not always attended by specialists: the importance of transnational, social, and economic dynamics that interfered in the process of the cultural construction of modern national identities. The projects of the Spanish nationalist intellectuals of the 19th century in relation to the definition of a national music were marked by the Romantic construction of Spanish musical exoticism, the new industry of entertainment, the existential situation of Spanish musicians, the formation of new artistic and musical fields, and the appearance of new forms of social distinction in the aftermath of the Spanish Liberal Revolution of the 1830s.