MUSICAv0 is a configuration of the Community Earth System Model (CESM) Community Atmosphere Model with Chemistry (CAM-chem) using the Spectral Element (SE) dynamical core, with a any regionally refined (RR) grid. The scientifically validated regional refined grid is over the conterminous United States (CONUS). This configuration has been released in CESM2.2. Other regions of refinement will need to be created and evaluated by the user. Other global uniform resolution configurations are also available with this version. This configuration has been released in CESM2.2.
Running MUSICAv0 is essentially the same as running CAM-chem, as described on the CAM-chem wiki page.
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