heavy metal umlaut

I was thinking about the Motorhead logo, and googled "heavy metal umlaut" and found this extensive, seemingly academic Wikipedia entry on the matter. A bit father down the the Google return is John Udell's "screencast" on the open source, er, development of the Wikipedia entry. And much of the rest of the return is discussions (e.g., e.g., e.g.) of Udell's discussion of Wikipedia's discussion of the "heavy metal umlaut" (that being said, this entry is a discussion of discussions of Udell's discussion of Wikipedia's). You know, it's the internet. Other highlights from my brief journey include: there's a gay heavy metal band/cabaret act Pink Stëël who have two consecutive umlauts; the band Assück; and it's nü-metal and not new-metal.