The duo project of Berlin-based Australian musicians Rebecca Lane (quarter-tone flutes) and Jon Heilbron (double bass) focuses on long-form works at the vanguard of microtonal and Just Intonation practice. Noted for their “precision, concentration and sympathy” (Gramophone), their recording of Catherine Lamb’s Muto Infinitas (Another Timbre) was named one of The Wire’s “Top Ten Contemporary Classical Albums” of 2021. Their subsequent album, a simultaneous realisation of Jakob Ullmann’s Solo I and Solo IV, was released at the end of 2025. They have premiered new microtonal works for their unusual instrumentation across Australia and Europe, including appearances at Louth Contemporary Music Festival (IE), Audible Edge (AU), Himera (FI), and Archipel (CH).

Lane and Heilbron are both active composer-performers within the fields of contemporary and experimental music. Outside their duo project, they are members of the Berlin-based Harmonic Space Orchestra (HSO), a performance and research collective focusing on extended Just Intonation; the quartet Asterales with Fredrik Rasten and Léo Dupleix; Anthony Pateras’ Dread of Voids quintet; and the European/Australian collective Phonetic Orchestra.