Immersive Virtual Musical Instruments (IVMIs) can be considered as the meeting between Music Technology and Virtual Reality. Being both musical instruments and elements of Virtual Environments , IVMIs require a transversal approach from their designers, in particular when the final aim is to play them in front of an audience , as part of a scenography. In this paper, we combine the main constraints of musical performances and Virtual Reality applications into a set of dimensions, meant to extensively describe IVMIs stage setups. A number of existing stage setups are then classified using these dimensions, explaining how they were used to showcase live virtual performances and discussing their scenographic level.