Sirenjaw documents the first meeting of three musicians who, while previously connected through various collaborations, had not performed together as a trio before this recording. The project brings together long-standing musical relationships: Lukas Koenig and Vinicius Cajado share a deep-rooted connection within the Viennese music scene; Koenig and Kit Downes have collaborated both live and on record; and Downes and Cajado have recently worked together in a range of ensemble contexts in Berlin. The recording took place during a hot summer day in Vienna, where the trio approached the meeting with an open and immediate focus on collective improvisation. The resulting recording captures this initial encounter and serves as the foundation for an ongoing collaboration. Sirenjaw marks the beginning of a new ensemble, shaped through process, presence, and a commitment to collective exploration.