  Recent theoretical claims not withstanding, muons can and do oscillate. Muons
produced in association with neutrinos (if masses and mixing angles are
nonzero) exhibit a joint oscillating spatial distribution. The possible use of
muon oscillations as a probe of neutrino mass and mixing parameters is
discussed using very simple physical arguments. Space-time oscillations in the
secondary decay vertices of muons (produced by pion decay) persist after
summing over all undetected neutrinos.
