Just in case you needed proof:
How playing an instrument benefits your brain (video)
Also of interest:
Allison's Brain - listen online
In 2011, Allison Woyiwada -- a retired music teacher -- was told that she had a giant brain aneurysm. After surgery, she experienced severe cognitive and physical defects. But then she began a programme of music therapy: this is the remarkable story of her brain's recovery.
Go to: http://www.cbc.ca/radio/ideas
Click on the title as seen below (scroll down when you arrive at above link)
It looks like this:
This CBC radio recording of "Ideas - Allison' Brain" will be good for approx. 2 weeks.