Terence Michael Joseph "Geezer" Butler (born 17 July 1949) is an English musician and songwriter. He is best known as the bassist and primary lyricist of the heavy metal band Black Sabbath. He has also recorded and performed with Heaven & Hell, GZR, and Ozzy Osbourne. Butler was the bassist of Deadland Ritual, which has since disbanded.

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Geezer Butler is an influential English musician and songwriter best known as the bassist and primary lyricist of the pioneering heavy metal band Black Sabbath.
He is primarily known for shaping the sound and lyrical themes of heavy metal with Black Sabbath, as well as appearing in music documentaries such as Black Sabbath: The End of The End and God Bless Ozzy Osbourne.
He is most famously associated with Black Sabbath, and has also performed and recorded with Heaven & Hell, GZR, and Ozzy Osbourne.