 Some groups add the marimbol, a plucked key box bass, and the cajón, (although the Peruvian version, not the Mexican cajón de tapeo).The most widely known "son jarocho" is "La Bamba", which has been popularized through the version by Ritchie Valens and the American movie of the same name.Other famous "sones jarochos" are "El Coco" and "La Iguana" and "El Cascabel", all of which have a call and response form, and "El Chuchumbé", "La Bruja".