Anyone speak Finnish?

[alanforduk]

On the excellent Peel-Miscellaneous-amusing-clips-and-anecdotes compilation, John plays a folk tune which he introduces as a "Centuries-old Reindeer-roasting song from Finland". I assumed this was a joke.

At the end, he says it's by Värttinä, and that the album it's from was the 10th most-played folk LP on european radio. Unfortunately, in a rare lapse, he neglects to tell us (or even have a stab at pronouncing) the name of the track and the name of the LP.
Well folks, I've managed to identify it as 'Marilaulu' from the LP 'Oi dai' (1991).
Finnish lyrics here:
http://www.lyricsmode.com/lyrics/v/vrttin/marilaulu.html

Anyone know what it's really about?

Alan