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. Emerging in the early '80s, the group's first two studio LPs, Psalm 9 (1984) and The Skull (1985), are considered seminal in th...