The title track refers to the International Brigades. Some themes featured in the other songs include globalisation, American imperialism and Basque nationalism. Most of the lyrics are sung in euskera. Almost every track is a collaboration with another artist or band. Tracks 3, 5 and 13 were recorded in Los Angeles (Cherokee Studios), tracks 6 and 12 in Azkarate, track 1 in Rome, track 2 in Caracas, track 4 in Biarritz, track 7 in Paris, track 8 in Barcelona, track 9 in Montreuil, track 10 in Havana, track 11 in Buenos Aires and track 14 in London.

...
Wikipedia