What in the world is a lituus? Apparently, it's an instrument, but we don't have any surviving examples of it. We don't even have any pictures of it. About all we know is that Johann Sebastian Back called for two of them in his cantata, “O Jesu Christ, meins lebens licht”. Well, that isn't good enough for some people. The lituus has been recreated with the help of some advanced software. Click here to read the story and to hear the lituus in performance.