This document discusses various music theories including Keith Negus' theory of organic and synthetic artists. Organic artists have a more naturalistic approach with relatable images while synthetic artists have more constructed star images. Examples are given of music videos by organic artist Ben Howard featuring a natural performance in a countryside setting with low budget, compared to synthetic artist Katy Perry's "Dark Horse" video with a high budget studio setting enhancing her star image through performance and close-ups. The document also covers different types of conventions like symbolic and technical that distinguish genres and target audiences.