Polka northern Mexico and Texas, and are also called "Norteño". Traditional dances from this region reflect the influence of polka-dancing European immigrants. In the 1980s and 1990s, several American bands began to combine polka with various rock styles (sometimes referred to as "punk polka"), "alternative polka", or "San Francisco-style". 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
Polonaise-Fantaisie (Chopin) and Vladimir Horowitz had been including it in their programs some decades earlier. It is intimately indebted to the polonaise for its metre, much of its rhythm, and some of its melodic character, but the fantaisie is the operative formal paradigm (Samson, 1988), and Chopin is said to have referred initially to the piece only as a Fantasy. Parallels with the Fantaisie in F minor include the work's overall tonality, A-flat, the key of its slower middle section, B major, and the motive of the descending fourth. Jeffrey Kallberg has suggested that the Polonaise-Fantaisie represents a change in Chopin's style