West of the Andes, the music is clearly influence by the indigenous Indian peoples. The panpipes and flutes of Peru are distinctive, as is their most popular rhythms. In Ecuador forms of the flute occur, but most of the music is influenced by the European waltz (as the "pasillo") and by various Afro-Latin styles from the Caribbean. Chile has the "cueca", introduced in 1824. It was the "most popular air of Chile". Despite this, the influence of the indigenous Indian peoples on latin music is much less noticeable than the influence of European and African music. There are dozens of folk rhythms which survive, but usually they have had had little or no effect outside their particular locale, whereas the influence of the Spanish and African peoples is seen almost everywhere. Even in the Argentine, the famous tango uses a rhythmical device known as the "cinquillo". This is a syncopated rhythm similar to that in the Cuban habanera. Syncopation and polyrhythms are unmistakable signs of Africa. The Argentine has a number of folktunes and rhythms of Indian origin, but the tango is dominant and the other rhythms are not.