In this paper we examine how the term ?Audio Augmented
Reality? (AAR) is used in the literature, and how the concept
is used in practice. In particular, AAR seems to refer
to a variety of closely related concepts. In order to gain a
deeper understanding of disparate work surrounding AAR,
we present a taxonomy of these concepts and highlight both
canonical examples in each category, as well as edge cases
that help define the category boundaries.