Cultural Funding
In Spain there are several organizations that lead the dissemination of their artistic expressions throughout the world. In particular, there is an important branch around the dissemination of flamenco music and dance as a style that is promoted in a special way. Jazz as a style has its place in this line of export.
The Spanish embassies present in different international countries have the possibility of supporting the visibility of spanish artists, although each embassy will work its cultural area in its particular way. The Instituto Cervantes has among its main functions to make spanish culture known all over the world, so financing the presence of spanish artists is a structural service in all its venues.
It could be any embassy, there is no a particular rule for this. Usually the embassies with physical venues in Spain and with specific cultural department, are more likely to work and collaborate with other countries.