In my quest to understand the relationship between trees and music, I seek out Brian Skarstad, an expert violin maker (he scoffs at the term "luthier") who makes violins by hand, employing many of the same techniques that violin makers have been using for hundreds of years. I talk to him about tonewood, how a violin is made and the myriad details that affect a violin’s sound and quality. It’s like opening a portal to a secret world.