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The harmonic-oscillator model of hadrons is generalized to include higher harmonics so that the degrees of freedom of the internal state of a hadron are equivalent to those of a violin string or organ pipe. Scattering amplitudes for the scattering of particles by the oscillator are constructed and shown to be equivalent to the dual-symmetric Veneziano model. Our method provides a direct construction of the amplitude in a manifestly factorized form.
Leonard Susskind (Sun,) studied this question.