Katie brings songs to life by uncovering their emotional core and amplifying it with intention and artistry.

Whether contributing a single instrumental line or crafting a full arrangement, her work is rooted in storytelling—enhancing each track’s depth, clarity, and resonance. Her contributions consistently elevate songs, helping them connect more powerfully with every listener.

Glass Heart String Choir

Katie Mosehauer is one half of the alt-folk chamber pop folk duo, Glass Heart String Choir. Internationally renowned for reveling at the intersection of classical virtuosity, existential poetics, and art-film surrealism, the art-pop duo weaves golden lyrical threads of haute-art into their achingly beautiful orchestral tapestry. They have toured the US and New Zealand, and opened for esteemed artists Devotchka, Emily Wells, and French for Rabbits.

Learn more at GlassHeartStringChoir.com.

  • "In a vast sea of disposable music, every once and a while something comes along that notches out its very own immaculately unique nook. Seatle’s Glass Heart String Choir has just released their debut EP ‘Light’. A five-track ode to the beauty of voice and the instruments that cradle it."

    Global Texan Chronicles

  • "The combination of Katie Mosehauer’s violin and Norman’s spare dobro work with Biell’s voice to give “Gone Without Me” a certain desolation which is bittersweet—alluring yet melancholic. A stunner."

    No Depression

  • “Light glows with complex luminous colors, supple textures, and a gorgeous liturgical aura.”

    Popdust

  • "Cinematic isn't my go-to genre, but my oh my do I love a well arranged string section with a proper dynamic sense. Glass Heart String Choir with "Stars (Falling Stars mix)" bring us just that in a composition that is artistic, approachable, emotional and cool - all at once."

    Music Dances When You Sleep

In Good Company

Since 2011, Katie has contributed award-winning string arrangements and performances to songs across a wide range of genres. Her work spans everything from intimate indie tracks to cinematic pop productions, always with a focus on enhancing the emotional core of each piece. What follows is a curated selection of favorite collaborations from the past 15 years—projects that showcase both musical range and the power of creative partnership.