strictly polyphonic, due to the drone parts having no melodic role, and can better be described as multipart. The polyphonic singing tradition of Epirus is a form of traditional folk polyphony practiced among Aromanians, Albanians, Greeks, and ethnic Macedonians in southern Albania and northwestern Greece. This type of folk vocal tradition is also found in North Macedonia and Bulgaria. Albanian polyphonic singing can be divided into two major stylistic groups as performed by the Tosks and Labs of southern Albania. The drone is performed in two ways: among the Tosks, it is always continuous and sung on the syllable 'e', using staggered breathing; while among the Labs, the drone is sometimes sung as a rhythmic tone, performed to the text of the song. It can be differentiated between two-, three- and four-voice polyphony. In Aromanian music, polyphony is common, and polyphonic music follows a set of common rules. The phenomenon of Albanian folk iso-polyphony (Albanian iso-polyphony) has been proclaimed by UNESCO a "Masterpiece of the Oral and Intangible Heritage of Humanity". The term iso refers to the drone, which accompanies the iso-polyphonic singing and is related to the ison of Byzantine church music, where the drone group accompanies the song. Corsica The French island Corsica has a unique style of music called Paghjella that is known for its polyphony. Traditionally, Paghjella contains a staggered entrance and continues with the three singers carrying independent melodies. This music tends to contain much melisma and is sung in a nasal temperament. Additionally, many paghjella songs contain a picardy third. After paghjella's revival in the 1970s, it mutated. In the 1980s it had moved away from some of its more traditional features as it became much more heavily produced and tailored towards western tastes. There were now four singers, significantly less melisma, it was much more structured, and it exemplified more homophony. To the people of Corsica, the polyphony of paghjella represented freedom; it had been a source of cultural pride in Corsica and many felt that this movement away from the polyphonic style meant a movement away from paghjella's cultural ties. This resulted in a transition in the 1990s. Paghjella again had a strong polyphonic style and a less structured meter. Sardinia Cantu a tenore is a traditional style of polyphonic singing in Sardinia. Caucasus region Georgia Polyphony in the Republic of Georgia is arguably (but no any strong confirmation) the oldest polyphony