  We show that quarkonia-like states of a hidden SU(N) gauge group can account
for the 750 GeV diphoton excess observed by ATLAS and CMS, even with
constituents carrying standard model hypercharge only. The required hypercharge
is modest, varying between about 1.3-1.6 for strong SU(N) coupling, to 2-3 for
weak SU(N) coupling, for N=3, 4. This scenario predicts a variety of diphoton
and multi-photon resonances, as well as photons from continuum pair production,
and possibly exotic decays into standard model fermions, with no multi-jet
resonances.
