special correspondent jared bowen of gbh boston reports that gauthier-- who will release a new book injuly, "saved by a song: the art and healing power of songwriting"-- says the effort to make these caregivers whole couldn't be more important. the story is part of our ongoing arts and culture coverage, "canvas." >> it was a tough year. >> reporter: this is a moment to heal the healers. five members of the emergency department at boston's brigham and women's hospital gather on zoom to write a song. >> and what my goal with you today is, to do, is to kind of get what's going on, and find a common thread that you all share. >> reporter: in a two-hour session, they'll revisit what they ultimately describe as the darkest, most uncertain year of their lives... >> it just keeps going. >> reporter: ...contending with the virus that ripped through their e.r. walking them back through it is nashville-based singer/songwriter mary gauthier. >> what's it been like? and, and, just kind of throw some words out, or experience out. >> it was a year of a lot of dualities. it's like, we were close, but