Krystal L. Demaine, Ph.D. has just published a book, “The Roots & Rhythm of the Heart: Our Musical Connection to Identity, Spirit, and Lineage.” The Beverly resident is a professor of expressive therapies at Endicott College. She has worked as a music therapist for 20 years. She had been planning to write a book about the heartbeat and rhythm, but the sudden death of her father, who had been a musician, sent her down a more personal path. The book, which is about, as she says, “lineage, vulnerability, concepts of connection,” includes listening recommendations and exercises. Demaine grew up in Rockport, and her family belonged to Temple Ahavat Achim in Gloucester. Her family still runs the Bearskin Neck Country Store. Her son currently attends the Sylvia Cohen Religious School, which she describes as “the most wonderful community that we’ve found.”