An ethnomusicologist whose lifelong quest has been to understand the nature of music will share the fruits of his venture during the Annual Humanities Lecture at the UI. Bruno Nettl, UI professor emeritus of music and of anthropology, will discuss "Ideas About Music and Musical Thought: Ethnomusicological Perspectives" at 8 p.m. today in the Levis Faculty Center. The talk is free and open to the public. According to Nicholas Temperley, UI professor of music and chair of the musicology division, Nettl is "one of the most famous musicologists in the world." Temperley said that Nettl's studies of several of the world's musical cultures have led Nettl to ponder "the universals of music, the forces underlying musical change and the interaction of musical cultures." In sum, Nettl has been on a "lifelong quest to understand the nature of music itself and its relation to other aspects of human life and experience," Temperley said. Nettl is internationally known in many aspects of ethnomusicology, including North American Indian music, European and American folk music, the music of Persia and the Middle East, and urban musical cultures. He is the author, co-author or editor of 18 books. His forthcoming book is "Heartland Excursions: Ethnomusicological Perspectives on Schools of Music." The Humanities Council of the College of Liberal Arts and Sciences established the Humanities Lectureship in 1977 to recognize outstanding achievement in the humanities at the UI and to provide a means by which a distinguished scholar could deliver a major address reflecting lifelong study.