A microphone with a bi-directional polar pattern. See Polar Pattern, Bi-directional.
"CD arrived last week - right on schedule as promised - and was Well Worth Waiting For! It was beautifully done and professional. Now after searching through cd stores in Massachusetts, Virginia, and Kentucky, over last ten years or so, we finally have one with Benny Goodman's "Swing into Spring" on it. My husband sat and cried while it ..."