In 1988, metal was poised to finally make the leap from the shadowy fringes of music into the critical mainstream when Metallica were nominated for a Grammy for Best Hard Rock/Heavy Metal Performance. But in one of the most incredible upsets in Grammy history, the award instead went to British prog-rockers Jethro Tull.

Fortunately, the incident didn't permanently damage Metallica, who turned in a slightly more mainstream direction with their next album and have gone on to become the most successful rock act of their generation. But still -- what if James Hetfield had taken up the flute in an attempt to chase Tull' critical success? Where would we all be then, huh?

See the Yearbook Photos of James Hetfield and Other Metal Stars

Learn About Metallica's Cursed 1992 Tour