Well, I have a number of favorite bands, but my first choice is Foo Fighters (even over other bands I adore like Metallica, Judas Priest, Iron Maiden, Pantera, U2, and Anthrax).
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Yeah, it's a shame what happened to the drummer. May he rest in peace.
Also, when I was researching the origin of the band's name, I discovered that the term "Foo Fighter" could also come from a series of comic strips by Smokey Stover, where there was a fireman whose vehicle was called, precisely, "Foo Fighter."