“Musical instruments are aids to the maintenance of health, and to the restoration of health once lost, according to the difference in the complexions of men. For this art of music was anciently ordained to draw the mind back into healthful habits, and thus doctors are dedicated to its use to cure bodies. Therefore they employ tones for the sick mind, just as they do medicines for the sick body.”
– Ibn Butlan, ninth-century Iraqui physician
Cited in: Inge Kjemtrup, “The power of music therapy”, Pianist, Issue 59, April-May 2011. Warners Group Publications, p.66.