This is a commercial for Post Raisin Bran starring a whole bunch of actors who had to go around for the next few months and answer the eternal actor question — "What have you done lately?" — by saying, "I played a raisin." I seem to recall that at least one of the thespians in this spot later became quite famous but I can't recall who it was, nor can I recognize anyone. But I do remember some rather successful actor on some talk show admitting to having been in this commercial.
I do recognize but cannot put a name to the lead singing voice which I'm pretty sure did not belong to the man on-camera mouthing to it. There was some New York-based vocalist who sang in hundreds of radio and TV commercials, and also on a lot of the kids' records done by one of several singing groups that went under the name of The Sandpipers. Isn't that same guy heard on the famous "Mighty Mouse" record that Andy Kaufman used to use in his act? I think so. As we learned back here, this batch of Sandpipers consisted of Mike Stewart, Ralph Nyland, Dick Byron and Bob Miller…so I'm going to throw caution to the wind and guess that one of them is the voice of the lead raisin in this spot. Give a listen.