By Steve Newton It's a sad day for fans of '70s and '80s hard-rock and heavy-metal. Martin Birch, who produced and/or engineered more popular metal albums than most anyone, died earlier today at the age of 71. Birch produced such monumental loud-rock albums as Rainbow's Rising, Black Sabbath's Heaven and Hell, Blue Oyster Cult's Fire … Continue reading Martin Birch, producer of unforgettable hard-rock/metal albums, dies at 71