Several colleges now offer ballroom dancing as a credit for physical education, and often they will invite the public to attend the classes. These classes are typically about one hour long, once or twice a week, and last for about four to five months. Although the cost depends on the particular institution, ballroom dance classes offered here are usually very inexpensive or free. Whether you are dancing a slow dance such as the waltz or an upbeat dance like the jive, you need to choose attire that you can move easily in and won't get tangled up around your partner. For example, consider choosing a dress made of silk; it flows easily and doesn't tangle. Remember that although ballroom dancing is a formal and elite event, your dress doesn't have to be covered in heavy sequins, jewels, or feathers. The wealthy section of Cuban society preferred the Danzon, which is an even slower Rumba using very small steps and more subtle hip movements. The modified version of the Rumba known as the Son was introduced to Americans in 1913. In the late 1920's Xavier Cugat formed an orchestra specializing in Latin American Music which really didn't develop a following until around 1929. Waltz music can be found in many venues, some examples are: The Blue Danube by Johann Strauss Jr, Show Me the Way by Styx, Waltz to the Death from the Batman soundtrack by Danny Elfman. Either Waltz can be danced to any music with a three-quarter tempo regardless of whether it is classical, rock, country or anything else. The desired movements are very sharp and well defined. The music for this ballroom dance is usually provided by an orchestra that has a piano, guitar, violin, flute and a bandoneon (an offshoot of a koncertina, which looks a little like a small accordion). The bandoneon is essential to Tango music. The Tango has always been a very popular dance with Hollywood moviemakers. The Cha-Cha is a fun, flirty, lighthearted dance that gets its distinctive "cha, cha, cha" rhythm because there are 5 steps danced to four beats. Dancers work parallel with each other in well synchronized movements sometimes employing the "New Yorker", a step where one of the dancers steps across the other and checks to change direction.