 Another of Paco de Lucía 's contributions was the inclusion of the cajón , an Afro @-@ Peruvian instrument Caitro Soto exposed to him during his visit to Peru in the late 1970s . He understood this instrument , which he saw as a permanent solution to the need for percussion in flamenco . Along with Rubem Dantas , he added its percussive elements and it became an essential tool of contemporary flamenco and later , other international musical trends . 
