Wagner changes the dynamics when the soft, solo ends and the full orchestra returns to loudly play the main melody.
This is the term that tells us of the way that the music has to be played. It tells us of how loud it should be played or how low it should be played. It is a marked element of performance and it helps to show the mood of the piece that is being played.
Hence we can say that Wagner changes the dynamics when the soft, solo ends and the full orchestra returns to loudly play the main melody.
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