Heh, the song they’re listening to is ”The Oresund Song” http://www.youtube.com/watch?v=D6Hndsyfn6M
A translation of the whole song won’t be necessary. All I need to tell you is that it’s about a Swede and a Dane who are in love and “enjoying each other’s company” on Oresund (The water that separates Denmark from Sweden and Norway) Then a Norwegian shows up and asks if he can join, which they think is a great idea, and they all proceed to have very gentle sex in the boat. I think the video explains everything else.
I imagine that right after this, Sweden starts wacking Norway with his fishing-rod to get him to turn of the radio.