Do not take up music unless you would rather die than not do so.
As far as the execution is concerned ... the most frequent and most serious mistake is to follow the music instead of preceding it.
Great art likes chains. The greatest artists have created art within bounds. Or else they have created their own chains.
False notes can be forgiven, false music cannot.
A great work is made out of a combination of obedience and liberty.
Art is not emotion. Art is the medium in which emotion is expressed.