This is a rehersal of the norwegian entry in Europe's biggest song competition (ESC) where every country once a year submit a contestant to represent their country. Last years winner host the following year. The show is seen live on tv throughout europe by approx 600 million people and is one of the biggest tv-shows here. Audience watching the show live in the hall is about 20 000 people. After every country's had their go, each country vote and submit their countrys points and its all added up to decleare the winner. In 1974 Abba won with Waterloo so this contest have rocketed some carriers. My country Norway has won a couple of times and in putting the show on takes a lot of combined efforts. Your observations regarding tv vs audience is true btw. Its all done for tv, however, being there is quite fin and spectacular. Especially for us interested in the technique and such. Its a massive machinery.