Angine de Poitrine can be aptly described as an interface between free microtonal music and non-European tonal systems. While the term "microtonal" in the Western context is often associated with theoretical construction and precisely defined intervals, here it appears more as a sonic device that unfolds organically. In this respect, clear parallels emerge with traditional forms such as the Arabic maqam system and the Indian raga practice. As in these systems, melodic development takes center...