Souls of Black (1990) is Testament's fourth studio album, a thrash metal statement that blends razor-sharp riffs, socially conscious lyrics, and a darker, more refined production style. Showcasing the band's technical precision and Chuck Billy's commanding vocals, the album delivers standout tracks like the title cut "Souls of Black" and "Face in the Sky," tackling themes of corruption, injustice, and personal struggle. With it's tight musicianship and accessible yet aggressive sound, it bridges Testament's underground roots with broader metal appeal, making it a must-have for fans seeking both intensity and substance.