With his intuitive approach to improvisation and exploration of timbres, Berlin-based Portuguese cellist, improviser and composer Guilherme Rodrigues is using both classical and extensive playing techniques. His first duo recording with trombonist Sebi Tramontana, entitled Han Jiae, is one of the rare albums that are released outside of his family-run homelabel Creative Sources. Rodrigues talks about his collaborative work with Tramontana, the title of the recording, his formative years as an improvising musician, moving to Berlin, and about his activity on the Berlin and Lisbon improvised music 'landscapes'. Interview.