2 and 3 being practically the same, careless listeners may easily confound one with the other. Nevertheless, the differences between the two works are many and great, and a deep insight into the workings of Beethoven's mind would be vouchsafed students if they were brought into juxtaposition in the concert-room. The reason commonly given for the revision of No. 2 (the real No. 1) is that at the performance it was found that some of the passages for wind instruments troubled the players; but among the changes made by Beethoven, all of which tend to heighten the intensity of the overture which presents the drama in nuce may be mentioned the elision of a recurrence to material drawn from his principal theme between the two trumpet-calls, and the abridgment of the development or free fantasia portion. Finally, it may be stated that though the "Fidelio" overture was written for the revival of 1814, it was not heard at the first performance in that year. It was not ready, and the overture to "The Ruins of Athens" was played in its stead. Footnotes: {1} As the opera is performed nowadays it is in three acts, but this division is the work of stage managers or directors who treat each of the three scenes as an act. At the Metropolitan Opera House, in New York, Mr. Mahler introduced a division of the first scene into two for what can be said to be merely picturesque effect, since the division is not demanded by the dramatic situation. {2} In Mr. Mahler's arrangement this march becomes entr'acte music to permit of a change of scene from the interior of the jailer's lodge to the courtyard of the prison prescribed in the book. CHAPTER VI "FAUST"