There also exist Curaçaoan polkas, Peruvian polkas (becoming very popular in Lima). In the pampas of Argentina, the "polca" has a very fast beat with a time signature. Instruments used are: acoustic guitar (usually six strings, but sometimes seven strings), electric or acoustic bass (sometimes fretless), accordion (sometimes piano accordion, sometimes button accordion), and sometimes some percussion is used. The lyrics always praise the gaucho warriors from the past or tell about the life of the gaucho campeiros (provincial gauchos who keep the common way). The polka was very popular in South and Southwest of Brazil, where it was mixed with other European and African styles to create the Choro.