River Adomeit is a songwriter and improviser deeply rooted in the American folk and jazz traditions. Originally from the United States and currently residing in Amsterdam, the Netherlands, River casts a wide net of influences that he seamlessly incorporates into his bold and concentrated approach to composition and performance.

River earned his master’s degree summa cum laude from the Conservatorium van Amsterdam and was recently announced as one of the newest members of the Splendor collective. He has performed with improvised music luminaries (Jamey Haddad, Joris Roelofs, Michael Vatcher, Billy Childs, Yuri Honing, and Matt Wilson,) and has taken part in performances and tours across Europe, Japan, Brazil, India, Nepal, South Africa, and Israel.

His bold and concentrated approach to composition and performance earned him the title of Jonge Maker for Jazzfest Amsterdam 2024, where he used the position to explore a more theatrical approach to improvisation. Together with co-conspirator Beatrice Sberna, "Gestour” was born, a vocal/bass duo that infuses their music with comedy and satire.

As leader of improv-folk trio Flatland Prayer, River takes an interdisciplinary approach to songwriting. The trio’s unique incorporation of theater, visual arts, and spoken word resulted in their winning of Keep an Eye: The Records 2025, for which they will be releasing a new album in January 2026. Flatland Prayer exclusively works with through-composed sets of music with their own distinctive storyline and narrative flow; they’ve tackled everything from identity and relationships to far-right extremism .

In addition to his work as bandleader, River is also an accomplished sideman. He is the current bassist for Mongolian jazz/folk singer Enji, with whom he has performed at venues in 10+ countries such as the Barbican in London, North Sea Jazz Festival in Rotterdam, and SXSW in Austin, Texas.