Indigenous music can be found in Otomi areas, such as in the municipalities of Amealco and the arid central areas of the state. Often this includes trios consisting of two flutes or two violins with a drum, most often played for community celebrations. The Otomi of Tolimán have a variant of Otomi music called "viñuetes", which is played with one large drum, one small drum and a violin. Huapango is a dominant musical form in the Sierra Gorda and some of the arid areas of the center of the state. Two types are generally played: Huasteco and Arribeño. Huasteco is played in trios with two guitars called "huapanguera" and the smaller "jarana huasteca" and a violin. The songs consist of stanzas of four to six verses sung in falsetto, often with improvisation. The Arribeño is most common in the mountains areas bordering the states of San Luis Potosí and Guanajuato. It is played in groups of four with a "huapanguera", a "vihuela" and two violins. Lyrics tend to be poetic and sung from memory or improvised. Some are religious in nature. Another indigenous form of music, called "comesolos", played with a flute and drum has almost completely died out. In the mountain village of San Joaquín in April is the Concurso Nacional de Huapango Huasteco (National Huasteca Huapango Contest) . This event attracts thousands of visitors and participants each year, as it is the most important Huapango contests in the country.