  The relativistic precession model for quasi periodic oscillations, QPOs, in
low mass X-ray binaries is reviewed. The behaviour of three simultaneous types
of QPOs is well matched in terms of the fundamental frequencies for geodesic
motion in the strong field of the accreting compact object for reasonable star
masses and spin frequencies. The model ascribes the higher frequency kHz QPOs,
the lower frequency kHz QPOs and the horizontal branch oscillations to the
Keplerian, periastron precession and nodal precession frequencies of matter
inhomogeneities orbiting close to the inner edge of the accretion disk. The
remarkable correlation between the centroid frequency of QPOs in both neutron
star and black hole candidate low mass X-ray binaries is very well fit by the
model. QPOs from low mass X-ray binaries might provide an unprecedented
laboratory to test general relativity in the strong field regime.
