  In this paper we study the initial-boundary-value problem for the barotropic
compressible magnetohydrodynamic system with slip boundary conditions in
three-dimensional exterior domain. We establish the global existence and
uniqueness of classical solutions to the exterior domain problem with the
regular initial data that are of small energy but possibly large oscillations
with constant state as far field which could be either vacuum or nonvacuum. In
particular, the initial density of such a classical solution is allowed to have
large oscillations contain vacuum states. Moreover, the large-time behavior of
the solution is also shown.
