  We propose a five-dimensional framework for modeling low-energy properties of
QCD. In the simplest three parameter model we compute masses, decay rates and
couplings of the lightest mesons. The model fits experimental data to within
10%. The framework is a holographic version of the QCD sum rules, motivated by
the anti-de Sitter/conformal field theory (AdS/CFT) correspondence. The model
naturally incorporates properties of QCD dictated by chiral symmetry, which we
demonstrate by deriving the Gell-Mann-Oakes-Renner relationship for the pion
mass.
