Ingeneral, therefore, color isa means ofexerting a direct influenceuponthesoul.Coloristhekeyboard.The eyeis the hammer. The soul is the piano, with its many strings.

-Kandinsky,Wassily
Quoted in K C Lindsay and P  Vergo (eds and trans) Kandinsky: Complete Writings on  Art (1982).

and I am sweating a lot by now and thinking of leaning on the john door in the 5 SPOT while she whispered a song along the keyboard to Mal Waldron and everyone and I stopped breathing

-O'Hara, Frank
  Of Billie Holiday. Lunch Poems,'The Day Lady Died'.