Beyond Every Note

I found a violin in my grandfather's studio,
It was the end of summer when I came over to watch the concert.
It was two days after when I found it,
Hidden at the back of the studio.
It wasn't placed there for safe keeping,
It was kept hidden so it wouldn't be found.
I didn't put too much effort thinking who the owner would me,
But then a picture at the back of a tag on the violin's bow caught my attention.