  We address the question of the possible existence of massive gauge bosons
beyond the $W^{\pm}$ and $Z^{0}$ of the standard model. Our intuitive and
aesthetic approach is based on quiver theory. Examples thereof arise, for
example, from compactification of the type IIB superstring on $AdS_5 \times
S_5/ Z_n$ orbifolds. We explore the quiver theory framework more generally than
string theory. The practical question is what gauge bosons to look for at the
upgraded LHC, in terms of color and electric charge, and of their couplings to
quarks and leptons. Axigluons and bileptons are favored.
