Jazz music is built on improvisation. It is a musical language that is expressed in the moment. But how is the jazz musician able to express so creatively in that moment.
Dr. Charles Limb, a professor at the University of California, San Francisco began a study to find out how. He commissioned a non magnetic piano with plastic keys that could be played while a musician was in an MRI scanner. He not only studied musicians, but he studied free-style rappers, improvisational comedians, and caricaturists.
Some interesting observations were made. First off, "right-brained" people are not more creative. In fact, both the left and right brain are used in creativity.
He came to the conclusion that everyone is creative. But the creativity is limited by expertise. What does this come down to? Practice. Putting in the time, effort, and practice provided way to the expertise and therefore the creativity.
Would you like to read more? Here is a link to the study and a link to an article on the study.