Abstract
We study the large ${N}_{c}$ behavior of couplings among light meson states with different compositions in terms of quarks and gluons. We shortly review the most common compositions of mesons, which are of interest for the understanding of low-lying meson resonances, namely, the ordinary quark-antiquark states as well as the nonordinary glueball, tetraquark, and other states. We dedicate special attention to Jaffe's generalization of the tetraquark with ${N}_{c}\ensuremath{-}1$ $q\overline{q}$ pairs, which is the only type of state we have identified whose width does not necessarily vanish with ${N}_{c}$, though it does decouple exponentially with ${N}_{c}$ from the $\ensuremath{\pi}\ensuremath{\pi}$ channel, so that it is weakly coupled to the meson-meson system.
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