what is the difference between temperament and disposition? What I want to express is: a person who has practiced paiting, drawing or playing piano for years has a ??? which other people may not have.
Oh, that is an interesting question! In common usage, "temperament" suggests emotion, and ability to control one's temper, whereas disposition is very broad, and means something like your "attitude toward" something. You would write, for example, "The meditative and often solitary experience of playing the piano, with narrowed focus and tranquil mind, refines the musician's temperament from one session to the next." Temperament is better. However, the true definition of "temperament is different, and it involves genetic traits as they manifest in the personality... so, it is not quite right. You could write:
"The meditative and often solitary experience of playing the piano, with narrowed focus and tranquil mind, refines and deepens the musician's consciousness from one session to the next."