There is a particular tone on the D string of my son’s violin that is pure lovely. A certain timbre. The odd thing is the string is old and should be replaced, so it suggests the timbre is coming from his bowing and playing of the string.

Another peculiar thing is how the ear can be attracted to and isolate the sounds it likes and yet for whatever undulating mishap in my brain I cannot read the notes very well on the D string, better than the G string which I cannot read at all. By rights my ear should be nesting with A or E sounds since I am familiar with them on the score.

There’s something “tunnel” or cylindrical is about that rich tone of the D string.