The development is totally devoted to the unfolding of the two themes which have the same root. There is no other symphonic movement in European music history that manages to create such a tonal universe out of these small basic elements.
At first Beethoven modulates from E-flat major to F minor.
The slightly modified fate motif remains the vital force of the development. The pianissimo rises in crescendo to a fortissimo of the whole orchestra, now Beethoven does without the 3rd step of the fate motif and reduces the three beats to two.
The secondary theme is introduced into the process in fortissimo, its 2nd and 3rd bars are used as well. The general tonal colouring is gained by the confrontation of strings and woodwinds.
The oboe forms a plaintive nostalgic epilogue in a brief one-bar cadenza, placed on the final G of the dominant chord of G major.
In the recapitulation the arrangement of the musical material is similar to the exposition. The fate motif recurs; a change of key is necessary as the secondary theme is played in the related major key, i.e. in C major, according to the rules of the classical sonata form.
The epilogue starts.
The Coda heightens the tension. The fate motif as a part of the main theme dominates the process.
In the secondary theme the interval steps have been changed.
The 3rds of the secondary theme develop into a new theme in regular quarter-note rhythm.
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