  If the number of colors Nc is taken large, baryons and their excitations can
be considered in a mean-field approach. We argue that the mean field in baryons
breaks spontaneously the spherical and SU(3) flavor symmetries, but retains the
SU(2) symmetry of simultaneous rotations in space and isospace. The one-quark
and quark-hole excitations in the mean field, together with the SU(3)
rotational bands about them determine the spectrum of baryon resonances, which
turns out to be in satisfactory accordance with reality when one puts Nc=3. A
by-product of this scheme is a confirmation of the light pentaquark baryon
Theta+ = uudds-bar as a typical Gamov-Teller resonance long known in nuclear
physics. An extension of the same large-Nc logic to charmed (and bottom)
baryons leads to a prediction of a anti-decapenta (15-bar)-plet of charmed
pentaquarks, two of which, Beta++_c = cuuds-bar and Beta+_c = cudds-bar, may be
light and stable with respect to strong decays, and should be looked for.
