The present disclosure relates to music composition devices and methods. A system is provided which allows composers of all skill levels to easily create music that is pleasurable to the ear. The system may also assist more advanced composers in creating complex musical arrangements based off of partially completed compositions. The system also streamlines composition and arrangement in multi-instrument environments. The user is able to select from a variety of available music visualizations and instrument views, allowing comparison therebetween. The system may comprise composition error checking functions, free-play performance abilities, and recording and playback features. Certain embodiments incorporate remote access for collaboration between users.