Sometimes I can only groan,
                              and suffer, and pour out 
  my despair at the piano !
                                                     ~Frederic Chopin

Nevertheless the passions, whether violent or not, should never be so expressed as to reach the point of causing disgust; and music, even in situations of the greatest horror, should never be painful to the ear but should flatter and charm it, and thereby always remain music.
                                                
                                               ~Wolfgang Amadeus Mozart