By Dave Graham ZURICH (Reuters) -Tom Fischer was a struggling young Swiss musician in 1984 when Oscar-winning artist H.R. Giger threw him a lifeline: a striking cover for an album that became a heavy metal landmark by his next group, Celtic Frost. Once dubbed the "Black Sabbath" of the 1980s, Celtic Frost pioneered a maverick blend of extreme metal that influenced decades of thrash, death and symphonic metal – and even grunge legends Nirvana. October marks the 40th anniversary of Celtic Frost's To Mega Therion, an album that still graces greatest record lists of the era with its menacing cover by Giger, designer of the monster in Ridley Scott's horror sci-fi film "Alien". "We were nobodies at the time. We had nothing to lose, so we contacted Giger, not expecting anything," Fischer, 62, tol

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