I have a doubt about a musical analysis that I found on an italian book. The author wrote that in the final part of the Prelude n.2 op. 40 by Sergej Bortkiewicz, there is a repetition of the tonic note (B) alternated with a "diminished fourth degree".
Now, I know what is diminished fourth but I don't understand what the author is referring to, since I can't find a diminished fourth in those bars.
In fact, I can't see neither a chord with a diminished 4th nor a diminished chord on the 4th degree of the B minor scale.
What do you think he was referring to?
There is the link with the op. 40