Commissioned by NASA for the Kronos Quartet and featuring pre-recorded sounds from the plasma around planets, Terry Riley's Sun Rings is about as close an experience to being in space as it is possible to be. The ten-movement 'spacescape', as Riley refers to it, is a multimedia work for quartet and chorus, opening with recorded audio of the static heard from radio emissions in space. These are all triggered by members of the quartet's hand movements over sensors.