Soundtrack

There is in fact a listing in the credits. After watching it, I was surprised that there were so many songs, because it's a documentary.
But for all who cannot watch it or don't want to wait, I decided to write it down below:

"Holzschuhtanz", lyrics and music by Heinz Lemmermann, performed by Gemischter Chor Wacken (mixed choir).
"Tennessee Waltz", written by Redd Stewart, Pee Wee King.
"Mein Egerland", folk tune, performed by Musikzug der Freiwilligen Feuerwehr Wacken (marching band of the volunteer fire department).
"Siyahamba", traditional from South Africa, performed by Gemischter Chor Wacken.
"Military Escort", written by Harold Bennett, performed by Musikzug der Freiwilligen Feuerwehr Wacken.
"Tale Of Revenge", music by Markus Toivonen, lyrics by Jari Mäenpää, performed by Ensiferum.
"Odenwald Walzer", [no author given], performed by Musikzug der Freiwilligen Feuerwehr Wacken.
"Pleasure To Kill", written by Miland Petrozza, performed by Kreator.
"Paranoid", written by Frank Iommi/John Osbourne/William Ward/Terence Butler, performed by "Die Duschband" ("The Shower Band", I presume).
"Breaking The Law", written by Kenneth Downing, Robert Halford, Glen Tipton, performed by Judas Priest.
"The Pursuit Of Vikings", written by O. Mikkonen, T. Lundström, J. Hegg, F. Andersson, performed by Amon Armarth.