One must play from the soul...
C. P. E. Bach: “Versuch über die wahre Art das Clavier zu spielen”
(1753 and 1762, Berlin)
It is not the heart alone which creates all that is beautiful, lyrical, tender, and enchanting; nor is it the brain alone which brings forth the well-constructed and clearly organized. The heart must reside close to the head.
A. Schönberg: “Herz und Hirn in der Musik”
(1946, Los Angeles)