Names for my Sophia book that was called The Violin

I need a name for The Violin. I am rewriting it and can’t call it that to resize it and what I want to do with it. The suggestions are:

 Sophia and the Stradivarius

The Stradivarius

Sophia’s Stradivarius

The lost Stradivarius

Sophia’s mysterious Stradivarius

Sophia’s Violin

Sophia and the Violin

It’s about a Stradivarius, Kanani that now talks and Sophia. It is part of a series A Sophia and Kanani Adventure.

Any suggestions? Do you like any of these names?

Thank you.