Wednesday’s column is a rarity for me: a celebrity interview. I chatted by phone with Terri Nunn, frontwoman of the band Berlin, with some trepidation. Would this work as a column, or would it end up being merely a promotional piece? (She’s performing and signing CDs Saturday in Claremont.) I think it works as a column — if not, it’s not Nunn’s fault, as she was engaging, relaxed and funny — but you can be the judge.