Marie's debut album Letterbox was released on April 28, 2017. She collaborated with producers Chad Copelin (Sufjan Stevens, Ben Rector, Train) and Eric Rosse (Sara Bareilles, Tori Amos, & Mary Lambert). Marie credits Copelin with helping strike the masterfully curated sound on the record saying, "trying to find the right fit to make the songs reflect what my sound was and not making it sound too country or making it sound too pop–making it that perfect blend of folk and pop is pretty hard to do, and I think Chad did an amazing job. But that took a long time."