This document discusses the concept of authenticity in sociolinguistic research and analysis. It begins by summarizing William Labov's view that sociolinguists should aim to observe language as it is used naturally, without the observer's influence. It then discusses how the concept of authenticity has been applied in various sociolinguistic approaches, such as relating authenticity to identity performance and language crossing. The document also examines tensions between notions of cultural and personal authenticity as they relate to musical performances. Overall, it provides an overview of how the idea of authenticity has been taken up in sociolinguistic studies and some of the issues surrounding its definition and application.