Galaxy Heart is Moss' fourth record for Constellation and the companion album to 2021's Phosphenes. Galaxy Heart features guest appearances by Jim White (Xylouris White, Springtime, Dirty Three) and Thierry Amar (Godspeed You! Black Emperor).

Jessica Moss is a violinist and composer based in Montréal. She uses amplified and processed violin and voice to create intricate works of expressive electronic, drone, experimental and post-classical Minimalism; her distinctive melodic sensibility often channels Klezmer, Balkan and Middle Eastern tropes, combined with an ear for the textural grit and timbral noise of post-punk, industrial and ambient metal. Moss played in cult agit-prop post-punk band Thee Silver Mt. Zion (2000-2015), has contributed to countless albums by the likes of Carla Bozulich, Vic Chesnutt and Matana Roberts, and most recently has guested on albums by Sarah Davachi and Big|Brave. She has released three solo albums on Constellation since 2017.