Ex-Black Sabbath bassist Geezer Butler says “the time is right” for him to write his autobiography — so that’s exactly what he’s doing. “I started out because when my parents died, I always wished I’d asked them a lot more things than I knew about,” Butler says. “I don’t really know much about my mum and dad, ’cause they were always just there. So I started writing a memoir for my grandkids to read, and that’s been fun going through stuff — old times and growing up in Birmingham and all that. I’m right in the middle of doing that at the moment.” Butler, who’s now 71, ended his 49-year career with Black Sabbath in 2017 when he and his bandmates wrapped up their “The End” tour in Birmingham.