Twins of a Gazelle is an "indie pop orchestra" consisting of dozens of musicians led by Dave Mann and based in Washington, D.C.
"Constellations," from an upcoming album, was written by Mann, with vocals provided by guest singer Emily Chimiak. It's a delicate and yet powerful song, with a lot of little sounds that make it audibly sparkle. Chimiak has a lovely voice, and blends the notes together to make the song go by smoothly; the outro is also particularly well-crafted. Take a listen:
Twins of a Gazelle - "Constellations"