Like mr_why says, it's mainly spanish.
I think I must've chatted to about 8 different sets of people during the night (it's that sort of night) and I'd say 1 was English, 1 was italian and the rest spanish.
That video isn't one that's just well edited so it gets the best bits and makes it look better than it is, it really really was like that ALL night. There weren't 30 mins that passed when something weird didn't happen.
I couldn't count the amount of times when I just turned around thinking wtf and saw everyone else smiling ear to ear as well.
I get goosebumps every time i look at it, not sure if I just got lucky on this night, but even if it's just half as good I'd say definitely go along.