How Playing an Instrument Benefits Your Brain

This: Ted Talk
And this:
"I think, so long as you remain deeply involved with the processes of your own imagination [...] it can serve as a sort of no man's land between that foreground of system and dogma, of positive action, for which you have been trained, and that vast background of immense possibility, of negation, which you must constantly examine, and to which you must never forget to pay homage as the source from which all creative ideas come."
-Glenn Gould, From "Advice to a Graduation" delivered at the Royal Conservatory of Music, University of Toronto, November 1964.