They said a few words to each other, and the music began.

They played Beethoven's 'Kreutzer Sonata.' Do you know the first presto?
Do you know it?
Ah!".

.

.
Posdnicheff heaved a sigh, and was silent for a long time.
"A terrible thing is that sonata, especially the presto! And a terrible thing is music in general.

What is it?
Why does it do what it does?
They say that music stirs the soul.