In tones of rust and tangerine, a woman's wavy locks trail down, her portrait inlaid like a cameo adorning an ancient Greek pedestal. Her curls mirror the long ribbonlike strands appointing the edges ...

I first met Kerry Devlin—and her acoustic guitar—years ago. She's a senior music therapist at the Johns Hopkins Center for Music and Medicine, and I was interviewing her for a story on how playing and ...