DEF-GAB-C is an Indonesian electronic music duo formed in 2004. The group consists of Ronald Steven and Debby Nasution. They are known for their experimental and eclectic sound, which blends elements of techno, house, and ambient music. DEF-GAB-C has released several albums and EPs, including "Terunggul Def Gab C," "Neolithic," and "The Essential Def Gab C." Their music has been praised for its originality and its ability to create a unique and immersive listening experience.