Hymnambulae has been played on NTS shows including Night Shift w/ Diamondstein, with Súmbolon first played on 17 March 2021.

Hymnambulae is a collaboration between siblings Pär Boström (Kammarheit, Cities Last Broadcast) and Åsa Boström. The debut album, Orgelhuset, was released on their own label and publishing house, Hypnagoga Press, and largely consists of tape recordings of organ, piano and voices, combined with deep droning ambient.