Аннотация:A quasipotential of the quark-antiquark interaction in a meson is constructed with inclusion of relativistic corrections of order nu-2/c2. The long-range confining potential is chosen as a mixture of vector and scalar terms. It is assumed that at large distances the quarks have an anomalous chromomagnetic moment. The mass spectra of heavy and light mesons are calculated and are in good agreement with the available experimental data. Predictions are obtained for the mass spectrum of B(c) mesons.