  A remarkable correlation between the centroid frequencies of quasi periodic
oscillations, QPOs, (or peaked noise components) from low mass X-ray binaries,
has been recently discovered by Psaltis, Belloni and van der Klis (1999). This
correlation extends over nearly 3 decades in frequency and encompasses both
neutron star and black hole candidate systems. We discuss this result in the
light of the relativistic precession model, which has been proposed to
interpret the kHz QPOs as well as some of the lower frequency QPOs of neutron
star low mass X-ray binaries of the Atoll and Z classes. Unlike other models
the relativistic precession model does not require the compact object to be a
neutron star and can be applied to black hole candidates as well. We show that
the predictions of the relativistic precession model match both the value and
dependence of the correlation to a very good accuracy without resorting to
additional assumptions.
