sentences:  Other common instruments include the catá or guagua, a wooden cylinder; the palitos, wooden sticks to strike the catá; shakers such as the chekeré and the maracas; scraper percussion instruments such as the güiro; bells, and cajones, wooden boxes that preceded the congas.During the 1940s, the genre experienced a mutual influence with son cubano, especially by Ignacio Piñeiro's Septeto Nacional and Arsenio Rodríguez's conjunto, which led to the incorporation of instruments such as the tres, the double bass, the trumpet and the piano, and the removal of idiophone instruments.At the same time, Cuban big bands, in collaboration with musical artists such as Chano Pozo, began to include authentic rumbas among their dance pieces.