The year 1976 was crucial for the evolution of heavy metal, as landmark albums like Rainbow's Rising and Scorpions' Virgin Killer began to reshape the genre. Perhaps none was quite as important as Judas Priest's sophomore effort, Sad Wings of Destiny, which simultaneously took heavy metal to new depths of darkness and new heights of technical precision. Building on the hard prog of bands like Queen and Wishbone Ash, plus the twin-guitar innovations of the latter and Thin Lizzy, Sad Wings fused these new influences with the gothic doom of Black Sabbath, the classical precision of Deep Purple, and the tight riffery of the more compact Led Zeppelin tunes. Priest's prog roots are still readily apparent here, particularly on the spacy ballad "Dreamer Deceiver," the multi-sectioned "Victim of Changes," and the softer sonic textures that appear from time to time. But if Priest's style was still evolving, the band's trademarks are firmly in place — the piercing, operatic vocals of Rob Halford and the tightly controlled power riffing of guitarists K.K. Downing and Glenn Tipton.