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What's more, the song structures generally feel less conventional and more challenging. Musically, the band continues further down the proto-prog metal road of Sabbath Bloody Sabbath, and this time around, the synthesizers feel more organically integrated into the arrangements. It also came during a lengthy and bitter legal battle between the band and their former management, which no doubt informed lyrical themes of betrayal and paranoia as well as the pervasive overall feeling of life itself unraveling. Sabotage came at a time when Sabbath was turning in one platinum record after the next, and critics were finally starting to appreciate the band as much as their fans. Sabotage is the final release of Black Sabbath's legendary First Six, and it's also the least celebrated of the bunch, though most die-hard fans would consider it criminally underrated. Principally recorded at Morgan Studios, London, England. Additional personnel: English Chamber Choir (background vocals). Black Sabbath: Ozzy Osbourne (vocals) Tony Iommi (guitar) Geezer Butler (bass) Bill Ward (drums).