Polka give way to the two-step and new ragtime dances. Polka dancing enjoyed a resurgence in popularity after World War II, when many Polish refugees moved to the US, adopting this Bohemian style as a cultural dance. Polka dances are still held on a weekly basis across many parts of the US with significant populations of central European origin. It was also found in parts of South America. There are various styles of contemporary polka besides the original Czech dance, which is still the chief dance at any formal or countryside ball in the Czech Republic. One of the types found
Polka polka op. 45 and other examples. Earlier, Johann Strauss I and Josef Lanner wrote polkas designated as a "galop" (quick tempo) or as a regular polka that may not fall into any of the categories above. The polka was a further source of inspiration for the Strauss family in Vienna when Johann II and Josef Strauss wrote one for plucked string instruments (pizzicato) only, the well-known 'Pizzicato polka'. Johann II later wrote a 'New pizzicato polka' (Neu pizzicato-polka), opus 449, culled from music of his operetta 'Fürstin Ninetta'. Much earlier, he also wrote a 'joke-polka' (German "scherz-polka") entitled 'Champagne-polka', opus