The cuatro is a family of Latin American string instruments played in Puerto Rico, Venezuela and other Latin American countries. It is derived from the Spanish guitar. Although some have viola-like shapes, most cuatros resemble a small to mid-sized classical guitar. In Puerto Rico and Venezuela, the cuatro is an ensemble instrument for secular and religious music, and is played at parties and traditional gatherings. Cuatro means four in Spanish; the instrument's 15th century predecessors were the Spanish vihuela and the Portuguese cavaquinho, the latter having four strings like the cuatro. Modern cuatros come a variety of sizes and shapes, and number of strings. Cuatros can either have single-strings, like a guitar, or double- or triple-coursed strings like a mandolin, and vary in size from a large mandolin or small guitar, to the size of a full-size guitar. Depending on their particular stringing, cuatros are part of the guitar or mandolin subfamilies of the lute family. Cuban Cuatro The Cuban cuatro (cuatro Cubano, or tres cuatro) is similar to a Cuban tres, but with 4 courses of doubled strings, instead of the usual 3 courses. It is usually tuned Puerto Rican cuatros The word cuatro first appears in 1828, when an activity that included stringed instruments was mentioned in a Puerto Rican newspaper. The word cuatro was used to represent the number of strings that the instrument initially had, but a 10 stringed, 5 course cuatro was made in 1887, as shown in a photograph taken in 1916. By 1922, cuatro music was being played on Puerto Rican radio stations, like "Los Jíbaros de la Radio" (1932) and "Industrias Nativas" (1934). After many years of constant rise in popularity, the Puerto Rican government approved a law in 2002 declaring that every year on November 17, the Commonwealth would celebrate "El día del Cuatro y del Cuatrista Puertorriqueño" (Day of the Cuatro and Puerto Rican Cuatro Player). Only a year later, the Puerto Rican cuatro was one of three instruments that were declared the National Instruments of the Commonwealth of Puerto Rico and important symbols of Puerto Rican culture. The Puerto Rican cuatro is shaped more like a viola than a guitar, and is the most familiar of the three instruments of the Puerto Rican orquesta jíbara (i.e., the cuatro, the tiple and the bordonua). The Puerto Rican cuatro has ten strings in five courses, tuned in fourths from low to