Septeto Nacional (National Septet), or the Septeto Nacional de Ignacio Piñeiro, is a group credited with expanding the Son (music) musical style after Arsenio Rodríguez hits. It added the trumpet to percussion, vocals, and strings. The group started as a sextet in 1927 in Central Havana. In 1929 it played at the World Exposition in Sevilla, and in 1933, it was invited to the "Century of Progress" World Exposition in Chicago. In the same year, Lázaro Herrera took over the group when Ignacio Piñeiro left it for financial reasons - despite their success the musicians earned very little.