Birch Book has been played on NTS shows including The Early Bird Show w/ Jack Rollo, with Birch Sap first played on 19 January 2024.

Birch Book is a side project of American musician Bobin Jon Michael Eirth (known as B'Eirth or B'ee) (lead singer, lyricist and sole songwriter for In Gowan Ring), in which he explores a less experimental and psychedelic side of his music, focusing instead on calm singer-songwriter-like pieces.