Baca bagian di handap ieu, tuluy ngajawab patarosan dina basa nu sarua jeung bagian: Passage: Geezer Butler <unk> bass, backing vocals (1968<unk>1979, 1980<unk>1985, 1987, 1990<unk>1994, 1997<unk>2006, 2011<unk>2017) Question: What's the first date time frame listed after Geezer Butler?
1968<unk>1979