  A general expression resembling Breit-Wigner formulae is derived for the
description of resonances which appear in meson-meson scattering. Starting
point is a unitarised meson model, but reduced to a simpler form and freed from
the specific assumption about the confining force. The parameters of the
resulting ``Resonance-Spectrum Expansion'' are directly related to the
confinement spectrum and the mechanism of $^3P_0$ valence-quark-pair creation
for OZI-allowed hadronic decay, and not to the central positions and widths of
resonances. The method also provides a straightforward explanation for the
origin of the light scalar mesons without requiring extra degrees of freedom.
