This text explores how electronic musical instruments and electronic music ensembles can relate to composition and music notation by discussing the instruments in terms of existing practice in traditional instrumentation and in relation to symbolic electroacoustic music analysis. Starting from orchestration theory, the text considers how electronic musical instruments behave and are used, both with support from the author’s own practice and from a case study with students within the framework of a live-electronic ensemble course. The case study reflected the participants’ practice as creative composers/musicians, and how their exploratory and experimental approaches to their instruments proved important, creating challenges for notation. Traditionally, music notation relies on continuous changes of simple parameters, while performances with complex electronic instruments may have just as important information to document regarding their initial connectivity and parameter settings.