My daughter, just retired as a teacher, had stuff by Lead Zepilin or some such which she played when young (lps still in a corner of the basement somewhere).
I figured she might know what head-banging music is, but she says she has heard the term somewhere but no idea what it means. Of course this is western Canada, and we are a little backward here.
I asked her husband, who plays in a celtic and western band from time to time, and he said it was what a drunken bodhran player did.

Yes, Littlehawk, I remember Jacques Piccard and his father, Auguste. I don't know if he had the rank of Capitaine, but he did work with the French Navy at one time.
In Middle English, eldritch meant fairyland, but it has come to mean weird.