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Another measure of a great band is its willingness to go out of its way to acknowledge its musical forefathers, and probably no artist has been as openly revered by Metallica – and deserving of this honor – as Motorhead and their immortal leader Lemmy Kilmister. In 1995, on the occasion of the metal icon's 50th birthday, all four members of Metallica donned mirror shades and mutton chops to perform several 'head classics as the Lemmys. Three years later they slapped four Motorhead covers – including their rip-roaring 'Overkill' – onto the 'Garage, Inc.' comp. That's respect.