  We describe properties of the M-theory five-brane containing $Q$ coincident
self-dual strings on its worldvolume. This is the five-brane description of Q
membranes ending on the five-brane. In particular, we consider a Maldacena-like
low energy limit in the six-dimensional worldvolume which yields a near
`horizon' description of the self-dual string using light open membranes, i.e.
OM theory, in an AdS_3 x S^3 geometry.
