G//Z/R is a band led by Birmingham born Black Sabbath bassist/lyricist Geezer Butler. On the three albums released so far the band has been known as G//Z/R, Geezer, and GZR, respectively. Despite the changing name, it is still considered the same project. However, Geezer Butler Band from the 1980s is an entirely separate entity. The bands music is generally of a much harder edge than Butler is known for in Black Sabbath. This isn't a surprise, as the vocalist on his first album, Plastic Planet, was Burton C.