It is common for some clubs and institutions such as sports clubs, schools and universities and even employers to arrange cèilidhs on a regular or at least annual basis. The formality of these can vary. Some mix modern pop music with a Scottish country dancing band and dress codes range from compulsory highland dress to informal. Knowledge and use of the basic dance steps is not always strictly necessary, and dances often alternate with songs, poetry recitals, story telling and other types of "party pieces".