The Tboli people () are one of the indigenous peoples of South Cotabato in southern Mindanao. In the body of ethnographic and linguistic literature on Mindanao, their name is variously spelt Tboli, T'boli, Tböli, Tagabili, Tagabilil, Tagabulul and Tau Bilil. Their endonym is Tboli. Their whereabouts and identity are somewhat imprecise in the literature; some publications present the Tboli and the Tagabili as distinct peoples; some locate the Tbolis in the vicinity of Lake Buluan in the Cotabato Basin or in Agusan del Norte. The Tbolis, then, reside on the mountain slopes on either side of the upper Alah Valley and the coastal area of Maitum, Maasim and Kiamba. In former times, the Tbolis also inhabited the upper floor of the Alah Valley. After World War II and the arrival of settlers from other parts of the Philippines, they have been gradually pushed to the mountain slopes. As of now, they have almost been expelled from the fertile valley floor. Like their immediate neighbouring tribes, the Úbûs, Blàan, Blit, Tàú-Segél, and the Tasaday, they have been variously termed hill tribes, pagans, animists, etc., as opposed to indigenous Muslim peoples or Christian settlers. In political contexts, however, the word "Lumad" (from the Cebuano for native people) has become a popular umbrella term for the various indigenous peoples of Mindanao. Music The Tboli have a musical heritage consisting of various types of agung ensembles – ensembles composed of large hanging, suspended or held, bossed/knobbed gongs that act as drone without any accompanying melodic instrument. Other instruments include the hegelung. Tboli religion The T'boli have a highly complex and unique religion composed of the life ways and belief systems inherent to their psyche. However, in modern times, their religion has been degraded to an extent due to the influence of Catholicism, Protestantism, and Islam. Nevertheless, some communities continue to preserve the religion practices of their ancestors, which is thousands of years old. Immortals Bulon La Mogoaw: one of two supreme deities; married to Kadaw La Sambad; lives in the seventh layer of the universe Kadaw La Sambad: the second supreme deities; married to Bulon La Mogoaw; lives in the seventh layer of the universe Cumucul: son of the supreme deities; has a cohort of fire, a sword, and shield; married to Boi’Kafil Boi’Kafil: daughter of the supreme deities; married to Cumucul Bong Libun: daughter of the supreme deities; married to S’fedat; could not