The idea of mixing sound and visuals is a common thing for our technologic world. It can be according to more systematic and comprehensive understanding of sound/music; for example giving an different visual to every individual note in the sound. Yet it can be putting different visuals to every new feeling in the sound or every new beat etc. without having a study on music, everybody can do it.
By thinking of sound in my project I try to shape the total idea behind it since every element will be integrated with each other. The appearence of visuals projected will act according to specific features of the sound so besides the mapping, projecting, etc, song played will be important.