At a time when heavy metal was moving forward faster than ever, thanks to the advent and growing popularity of thrash metal, Chicago's Trouble embodied a nostalgic throwback to the genre's old-school, '70s values -- and specifically a preference for the deliberate, slow-creeping style of the genre's founding fathers, Black Sabbath, which, in the able hands of Trouble and California's similarly backward-gazing Saint Vitus, came to be known as doom metal. Unfortunately, neither band, nor their few lesser-known colleagues (the Obsessed, Pentagram, etc.), ever achieved any commerc...