Music notation has evolved to accommodate music and musical instruments as they have changed over time. However, the rapid advancement of musical technology has not been accompanied by a corresponding development and consensus in notation. This paper examines the challenges faced by notation in representing music written for augmented instruments. We contend that a novel understanding of musical works is necessary and propose a work-concept that recognises the significance of the technology – medium – that composers develop alongside their creations. We emphasise the role of the score within this work-concept model and present an instrumental augmentation system as a case study. Finally, we propose notation guidelines for augmented instruments and argue that standardising notation could facilitate the discovery of common ground that guides the development of augmented instruments and music written for them.