Perhaps a dark horse contender (or a solid early entry if there is ever a Heavy Metal Hall of Fame) Mastodon could one day slip in should some of the bands they took over the mantle from (namely Pantera and Biohazard) ever receive the love from the Rock and Roll Hall of Fame that so many Metal fans claim is missing.  This a very well respected and well loved band, but Metal seems so far removed from what the Rock Hall deems “worthy”.