Mia asked for her cello that afternoon. Her grandmother had frowned, worried that this foolishness would waylay Mia’s recovery. But I jumped out of my chair and ran to my car and was back with the cello by the time the sun set.

After that, the cello became her therapy: physical, emotional, mental. The doctors were amazed at Mia’s upper-body strength — what her old music teacher Professor Christie had called her “cello body,” broad shoulders, muscular arms — and how her playing brought that strength back, which made the weakness in her right arm go away and strengthened her injured leg. It helped with the dizziness. Mia closed her eyes as she played, and she claimed that this, along with grounding her two feet on the floor, helped her balance. Through playing, Mia revealed the lapses she tried to hide in everyday conversation.

If she wanted a Coke but couldn’t remember the word for it, she’d cover up and just ask for orange juice.

But with cello, she would be honest about the fact that she remembered a Bach suite she’d been working on a few months ago but not a simple etude she’d learned as a child; although once Professor Christie, who came down once a week to work with her, showed it to her, she’d pick it right up. This gave the speech therapists and neurologists clues as to the hopscotch way her brain had been impacted, and they tailored their therapies accordingly.

But mostly, the cello improved her mood. It gave her something to do every day. She stopped speaking in the monotone and started to talk like Mia again, at least when she was talking about music. Her therapists altered her rehabilitation plan, allowing her to spend more time practicing. “We don’t really get how music heals the brain,” one of her neurologists told me one afternoon as he listened to her play to a group of patients in the common room, “but we know that it does. Just look at Mia.”