  Non-singlet ${\cal{O}}(\alpha_s^2)$ corrections from light quarks are
calculated analytically for the massive quark-antiquark pair production rates
through the vector, axial-vector, scalar and pseudoscalar currents for all
energies above the threshold. The results are presented in terms of the moments
of the absorptive part of the vacuum polarization function of the light quarks
which allows for an immediate determination of ${\cal{O}}(\alpha_s^2)$
corrections coming from other types of light particles. The kinematic regime
close to the threshold is examined.
