  In this paper we review the recent developments in the relativistic theory of
stellar pulsations with special emphasis on the spacetime or w-modes. We
discuss also the excitation of these modes and the information about the
neutron star that we will be able to mine from their detection. The paper will
appear in the Proceedings of the Les Houches School on Astrophysical Sources of
Gravitational Radiation, 1995, edited by J.-A. Marck and J.-P. Lasota to be
published by Springer-Verlag.
