Communicative contract analysis constructs an analytic methodology, taking musical semiotics as a theoretical basis, to look at the ways in which pieces of popular music define themselves generically, and how they make reference to other genres. By taking the different components of a sound as referential to parent genres or foreign genres, one can tease out these references in hybrid musical forms. The method is then applied to three contemporary works, The Kaiser Chiefs' Ruby, Hadouken!'s That Boy, That Girl and Bjork's Joga, and the pertinent issues raised in these works are discussed.