I wonder if this question has ever been arisen in one's mind. Thinking about ballroom & latin dances such as: Tango Argentina, Salsa... I don't mention about a competition but a dancing party (social dancing). As I known, in my country, a dancing party usually last for 2 hours. For a ballroom party, they play 10 dances in sequence, as social dance, but other can do just one dance (maybe in different styles such as Tango-Valse...) in a Tango Milonga, Salsa congress, etc... With my limited knowledge, I'm trying to explain as follow: with latin dance (Tango Argentina, Salsa...), though dancers have to accept some rules but it doesn't prevent them from creative power for new routines, action etc., providing that both partners feel comfortable, which seem to be suited for free instinct. One more reason that in the latin party you can find or change partner easier than in ballroom, though there're standard & latin in ballroom. What's your opinion?