Although Sumatra is the sixth largest island in the world and home to an estimated 44 million Indonesians, its musical arts and cultures have not been the subject of a book-length study until now. Documenting and explaining the ethnographic, cultural, and historical contexts of Sumatra's performing arts, this book also traces the changes in their style, content, and reception from the early 1970s onward. The book offers a fascinating ethnographic record of vanishing musical genres, traditions, and practices that have become deeply compromised by the pressures of urbanization, rural poverty, and government policy. It showcases the complex diversity of Indonesian music and includes field observations from six different provinces: Aceh, North Sumatra, Riau, West Sumatra, South Sumatra, and Bangka-Belitung. Featuring photographs and original drawings from Kartomi's field observations of instruments and performances, the book provides a comprehensive musical introduction to this neglected, very large island, with its hundreds of ethno-linguistic-musical groups.