The piano tuner and his equipment arrived on the morning milk train along with a full contingent of ghost groupies. He was taken first to the town hall and then to the back room of the museum . They wanted him to hear the piano being played but they didn't want him to see that it was being played by a ghost. He was told that people had paid to sit in on the concert and so he would have to wait until it was over. He listened to the concert and remarked that whoever was playing was a master but even such a great player couldn't hide the fact that piano needed tuning.
When the concert was over and the ghost groupies had left then they ushered him and his equipment into the room. Under the agreement he was allowed to look at but not open the piano until he put the blindfold on. He sat down, played each key, opened his equipment case and put on the blindfold.
The lady in charge lifted the top of the piano for him so he could get to the strings and he started.
One hour later he finished. The piano was in perfect tune. They handed him his check. He commented that he felt like he was cheating since they had that expert there guiding him and even tuning some keys for him. He was alone in the room the entire time.