  We consider a chain of torsionally-coupled, planar pendula shaken
horizontally by an external sinusoidal driver. It has been known that in such a
system, theoretically modeled by the discrete sine-Gordon equation, intrinsic
localized modes, also known as discrete breathers, can exist. Recently, the
existence of multifrequency breathers via subharmonic driving has been
theoretically proposed and numerically illustrated by Xu {\em et al.} in Phys.
Rev. E {\bf 90}, 042921 (2014). In this paper, we verify this prediction
experimentally. Comparison of the experimental results to numerical simulations
with realistic system parameters (including a Floquet stability analysis), and
wherever possible to analytical results (e.g. for the subharmonic response of
the single driven-damped pendulum), yields good agreement. Finally, we report
on period-1 and multifrequency edge breathers which are localized at the open
boundaries of the chain, for which we have again found good agreement between
experiments and numerical computations
