“Shave and a Haircut, Two Bits.” If that musical ditty doesn’t immediately ring a bell, I’ll tell you it is, or perhaps more properly used to be, a familiar (and jocular) ending for songs, particularly in bluegrass. I hadn’t thought of it for years, but I couldn’t get it out of my head for a couple of days recently, after making an amusing bungle of an attempt to make a simple appointment to have my hair cut.