Black Sabbath bassist Geezer Butler has announced Manipulations of the Mind, an upcoming CD box set collection his solo work.

The four-disc package includes his three solo records — 1995’s Plastic Planet, 1997’s Black Science and 2005’s Ohmwork — as well as a compilation of various demos, instrumentals and live recordings.

Plastic Planet notably features former Fear Factory frontman Burton C. Bell on lead vocals. Ex-Journey drummer Deen Castronovo plays on Plastic Planet and Black Science.

Each of Butler’s solo albums were released under different monikers: g//z/r for Plastic Planet, geezer for Black Science, and GZR for Ohmwork. For Manipulations of the Mind, the metal legend is simply referred to as Geezer Butler.

Manipulations of the Mind will be released July 30.

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