In terms of human expression, nuance, feeling etc, there is nothing that can be said about written music that can't be said about written speech.

written music is not limited to classical writing either.

You can draw lines, use punctualtion marks or use simple recognizable words to indicatewhat you want done.

A simple short glossary of symbols/terms allows shorthand to be used that makes things cobnsiderably easier.

In terms of interpretation, musicians are as likely to reinterpret stuff they have heard as they are to reinterpret stuff they have read.