  The single mode approximation has proved useful for the excitation spectrum
at $\nu=1/3$. We apply it to general fractions and find that it predicts $n$
magneto-roton minima in the dispersion of the Girvin-MacDonald-Platzman
collective mode for the fractional quantum Hall states at $\nu=n/(2n+1)$, and
one magneto-roton minimum for both the composite Fermi sea and the paired
composite fermion state. Experimental relevance of the results will be
considered.
