I worked on scores. I went to the musical library in Berlin which is very famous. I discovered that we had scores of Beethoven, printed scores of Beethoven, that are full of mistakes. Not the wrong or false notes, but the wrong dynamic, understandable things.
The message of music was also the first thing what I learned from my first teacher. She was an organist too and she was very devoted to what she played, so she had a respect for every piece and she felt that she is not allowed to add something of her own.
Since the composer has said everything, if you discover everything, it will be enough and you will be a happy man. Don't try to say it's your taste, and because of that you are changing this or that. And I must say this respect is still there.
The message of music was also the first thing what I learned from my first teacher. She was an organist too and she was very devoted to what she played, so she had a respect for every piece and she felt that she is not allowed to add something of her own.