  I discuss consequences of electroweak symmetry breaking by strong dynamics,
assuming the existence of a light composite scalar appearing as a
pseudo-Goldstone boson of some global symmetry of the new strongly interacting
sector. In such a scenario, the composite scalar has properties very similar to
the Standard Model Higgs, but the existence of additional resonances with
different spins is also expected. Properties and phenomenology of lightest
spin-1 resonances are considered in a simple general effective Lagrangian
description. The question whether the effects of spin-1 resonances can be
observed at the LHC, shedding light on the nature of the Higgs boson, is
addressed.
