  We use a light cone harmonic oscillator model to study S wave meson spectra,
namely the pseudoscalar and vector mesons. The model Hamiltonian is a mass
squared operator consisting of a central potential (a harmonic oscillator
potential) from which a hyperfine interaction is derived. The hyperfine
interaction is responsible for the splitting in the pseudoscalar-vector
spectra. With 4 parameters for the masses of up/down, strange, charm and bottom
quarks, 2 for the harmonic oscillator potential and 1 for the hyperfine
interaction, the model presents a reasonably good agreement with the data.
