Mary Gauthier

This singer-songwriter is celebrating the 20th anniversary of her third album, Mercy Now. The album cemented her as a songwriter of rare emotional depth, placing her in the lineage of many of her musical heroes and mentors, including John Prine, Guy Clark, Lucinda Williams and Tom Waits. She performs at 7 tonight at Music Box Supper Club. Fellow singer-songwriter Stephen Kellogg shares the bill, and the concert starts at 7:30 p.m.