  We provide a bird's-eye view of neutron-star seismology, which aims to probe
the extreme physics associated with these objects, in the context of
gravitational-wave astronomy. Focussing on the fundamental mode of oscillation,
which is an efficient gravitational-wave emitter, we consider the seismology
aspects of a number of astrophysically relevant scenarios, ranging from
transients (like pulsar glitches and magnetar flares), to the dynamics of tides
in inspiralling compact binaries and the eventual merged object and
instabilities acting in isolated, rapidly rotating, neutron stars. The aim is
not to provide a thorough review, but rather to introduce (some of) the key
ideas and highlight issues that need further attention.
