Chaim Dubin saw yesterday's fine Beatles medley by Raffaella Carrà and wrote in to say, "The video you posted is very close to capturing the essence of the Beatles, but in my opinion the following link contains the very best interpretation." He may be right. Here we have what he linked me to — Engelbert Humperdinck, Bing Crosby, Gwen Verdon, Bobbie Gentry and Dick Shawn virtually channeling John, Paul, George and Ringo. Mr. Shawn's performance even brings a little Lorenzo St. DuBoix into the mix…