There is no surviving recording of the Duke Ellington Orchestra’s performance of a piece that Ellington wrote for the orchestra late in his career. Two different bands have recently recorded the piece, each claiming to have made an authentic reproduction of the Ellington Orchestra’s performance. One of these two recorded performances, however, is much closer to Ellington’s own handwritten score, and must therefore be the more authentic of the two.
Which of the following, if true, most seriously weakens the argument?