The culmination of this period was the ballet "H. P." (i.e., Horse Power), also known by the Spanish title (1926–31) . "H. P." is a colorfully orchestrated score of ample dimensions and dense, compact atmosphere, notable for its dynamism and vitality, revealing the influence of Stravinsky and at the same time returning to folkloric and popular elements, with dances such as the sandunga, tango, huapango, and foxtrot . Such nationalisms would appear through the 1930s, notably in the Second Symphony (the of 1935–36, one of the few works by Chávez to quote actual Native-American themes), but only sporadically in later compositions .