We present the first musicological analysis of a Lelegesan performance, a form of musical expression of the Totoli people in Central Sulawesi. Our preliminary study of this participatory musical practice of an endangered language community describes the overall form of the Lelegesan, consisting of two-part stanzas with improvised lyrics but relatively stable melodic patterns. We report characteristics of a performance’s frequency spectrum by drawing on computational methods, enabling us to approximate the underlying musical scale. Our analyses show that different phrase types are clearly distinguishable in terms of their frequency content, and that final tones of opening and closing phrases are generally about a major third apart.