Affection & Affect
Some thoughts on musical expression from Johann Joachim Quantz:
"If musicians are not themselves moved by what they play, the cannot hope for any profit from their efforts, and will never move others through their playing, which should be their ultimate aim."
"Musicians cannot move others unless they themselves are moved; it is essential that musicians be able to put themselves in each Affection they wish to rouse in their audience, for it is by showing their own emotion that they awaken sympathy. In languishing, sad passages, they languish and grow sad. That is visible and audible."
"What does not come from the heart will not easily touch the heart."
And from C. P. E. Bach:
"One should play from the soul, and not like a trained bird."
And finally this familiar passage from Horace:
"It is not enough for poems to be 'beautiful'; they must also yield delight and guide the listener's spirit wherever they wish. As human faces laugh with those who are laughing, so they weep with those who are weeping. If you wish me to cry, you must first feel grief yourself."