Accuracy was not the Vox Vulgaris intent, nor was it achieved. There were a number of European bands who appeared in the 1990's doing medieval music with a lot of rock or heavy metal influence. I think it might have been started by the Germans: their own folk music was tainted so much after being appropriated by the Nazis that there was a real impetus for going to very early sources and so there were a number of heavy metal medieval bands like Corvus Corax who did essentially heavy metal with electric bagpipes and medieval /renaissance tunes.

There's very very little surviving Medieval dance music. [Timothy MGee's collection of dances](http://www.iupress.indiana.edu/product_info.php?products_id=63443 i) is just one slim volume, and it covers hundreds of years. The Saltarello on the Vox Vulgaris site is one of those. There are a lot of songs, however, in collections like the Cantigas de Santa Maria, Libre Vermell, and from the Troubadors and Minnesangers. The Cantigas lend themselves especially well to bagpipes - they're sometimes in odd meters, don't have a huge gamut, have catchy phrasing, and I see Vox Vulgaris did few of them. I'm not sure where the melodies in the "murderous medley" YouTube clip came from specifically. Maybe someone else will recognize them.

Because these pieces mostly survive as single melody lines ( though Vox Vulgaris also did Stella Splendens, which has two beautiful lines: compare it with Jordi Savalls' more scholarly version )it's possible to take one and rock out on it: get a good rhythmic groove going with percussion and some guitar-like instrument. A little of this is not unlikely- lots of pictures of medieval musicians show them holding percussion instruments and they liked a good solid beat as much as anyone, no doubt. But we know that medieval notions of harmony are not modern ones, and the guitarist/citternist in this band is using very full I,ii, IV,V and VII chords in progressions that are anything but medieval. And the pieces are structured in a very modern way (play the head twice, solo over chords, come back to head, blow, etc.) Since bagpipes have some of the same tonal qualities as electric guitar with distortion, the genres mix pretty well, though, which is why the music is fun.