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Geezer Butler Uses AI Guide Vocals to Finish Decades-Old Solo Material

In a Steel City Con Q&A, he described using vocal tech only to make clearer demos for human collaborators.

Overview

  • Butler said he is updating a large backlog of songs written since the 1980s by rendering vocal lines with synthetic guide tracks in his home studio.
  • He emphasized the tool is for pre-production, allowing him to present complete demo ideas to real singers and musicians who will record the final versions.
  • He acknowledged some fans consider the approach “cheating,” but framed it as a practical way to communicate melodies and lyrics more clearly.
  • He made the remarks during a Dee Snider–hosted session at Steel City Con in Monroeville, Pennsylvania, following Black Sabbath’s July 2025 farewell show.
  • Butler also said Tony Iommi’s solo album is in mixing with a Swedish vocalist and that Iommi asked him to record three bass parts in England, which he may not be able to do until June.