[mushishi]

> so the music has to be interpreted

Just to extend this point: My understanding of the topic might be far off as I haven't ever learned music under a teacher. But to me there's great deal of interpretation even with tempi marks that even good students just aren't thinking.

I sometimes enjoy watching masterclasses of players with wealth of experience. Andres Schiff is one of the most famous ones. Also Maxim Vengerov the violinist. Anyone that hasn't seen one masterclass should look up on youtube if that sound remotely interesting.