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It is proposed that meson resonances are linear combinations of q-qbar andmeson-meson (MM); baryon resonances are combinations of qqq and meson-baryon(MB). Mixing between these combinations arises via decays of confined states tomeson-meson or meson-baryon. There is a precise analogy with the covalent bondin molecular physics; it helps to visualise what is happening physically. Oneeigenstate is lowered by the mixing; the other moves up and normally increasesin width. Cusps arise at thresholds. At sharp thresholds due to S-wave2-particle decays, these cusps play a conspicuous role in many sets of data.

The covalent bond in Particle Spectroscopy