Hale denounces the proceedings because it is clear that the girls are not telling the truth in their testimony.
To denounce something is to explain why you disagree with it.
The answer is that the author has to bring to life a musical composition with only words.
Beethoven was a famous composer who had multiple works of art glossing mainly over piano, and orchestra. Explaining a piece of music to others, with only words would be, in other words. . . hard.
Hope this helps!!!
-The Scarlett Pimpernel
You should go to steam and find it or if you want go to school and download it