Eleni and Souzana Vougioukli started exploring world music very early and went on to experiment with the potential of human voice as an innate musical instrument. With specific emphasis on the original language and appropriate respect for pronunciation and articulation of each individual form, they sing in more than twenty languages and dialects a capella or accompanied by piano, guitar and percussions, instruments they play themselves. Their repertoire consists of traditional songs of various ethnic groups: rebetika and traditional Greek songs in all dialects including that of the Greek speaking community of Southern Italy, Portuguese fado, Spanish, Sephardic, French, Italian, Romanian, Turkish, Arabic, Gypsy, Serb, American blues and jazz, Armenian, Pomak (a Slavic dialect of the Rhodopi mountain in N. Greece) and Bulgarian, as well as their own compositions. All their songs stand out for their power of expression and their diachronic qualities both in terms of history and geography, whilst the basic focus of their research is on the deeper roots of each song. ELENI VOUGIOUKLI Eleni was born in Thessaloniki and grew up in Xanthi. She holds a BA in Balkan, Slavic and Oriental Studies of the University of Macedonia. She has also studied piano (from the age of 4), music theory and solo including all classical, Byzantine and jazz. Similarly, she studied Byzantine and jazz theory and music. She began performing traditional Greek songs from the age of 8 and she gave a lot of performances in official festivals such as that of Old Town Festival in Xanthi. She was awarded a lot of distinctions and first prizes in various competitions such as First Prize in a Capella category, in the National Competition organized by the Ministry of Education in 1997. As a member of traditional music groups, she has made many appearances and CD recordings with songs from Asia Minor, Thrace and other areas of Greece. She has studied classical and traditional dancing and she is involved in research in theatrical performance. SOUZANA VOUGIOUKLI Souzana was born and raised in Xanthi. She is a graduate of the Mathematics Department of the Aristotelian University of Thessaloniki, majoring in Pure Mathematics with 7 published papers in International Journals. She has studied piano (from the age of 4), guitar, advanced theory and solo, as well as jazz - song and theory. She is also involved in composing. She has studied classical, traditional and afro- jazz dancing, as well as theatrical performing. The study of the relationship between music and mathematics is one of the things which especially interests her, and her future ambition is to conduct further research in this area.