The Blue Man GroupDesign Practice
Perhaps a bit of a tangent, however, the Blue Man Group was one of the first things to pop into my head when we came up with a sound-based response to our brief.
Their work is a masterclass in integrating sound with visuals in the context of a live performance. They do this with different methods of colour visualisation, appropriate pre-recored visuals as well as complex custom-made musical instruments which react to inputs by outputting light and colour as well as sound.
It is interesting to note that the performances often use these projections and visualisations to deliver comedy. Perhaps something worth looking into.