  An examination of charged two-quark meson masses hinted that the mass ratio
of neighboring quarks could simply be a constant. The concept of a harmonic
quark oscillator based on a quark-antiquark pair is introduced. Unstable
symmetric state of the harmonic quark oscillator can be broken to an asymmetric
state with the formation the neighboring quark of lesser mass due to a weak
reaction. A new recurrent equation of quark masses is obtained and the model of
harmonic quark family is developed. The quark masses in the model are bound
together into one rigid chain. With the electromagnetic contribution taken into
account the quark masses are calculated with the 0.03 percent inaccuracy. It
follows from the model that the muon is a single u-quark mass state fixed as a
lepton. The neutral pion is probably a stable harmonic oscillator based on a
quark-antiquark u-pair.
