 De Lucía made a cameo appearance , dressed as a Mexican guitarist , in the 1971 western <unk> Caulder , playing the melody of Ken Thorne 's main theme over a string section . That year , he released the album El mundo del flamenco , which included a version of Mario Escudero 's Ímpetu , a bulerías . Guitar International mentioned his " very aggressive " approach to playing Ímpetu . Escudero was a major influence on de Lucía during this period , inspiring him to explore new possibilities for flamenco . He began working with record producer José Torregrosa . 
