  We experimentally investigate the velocity distributions of quasi
two-dimensional granular materials, which are homogeneously driven, i.e.
uniformly heated, by an electromagnetic vibrator, where the translational
velocity and the rotation of a single particle are Gaussian and independent. We
observe the non-Gaussian distributions of particle velocity, with the
density-independent high-energy tails characterized by an exponent of
$\beta=1.50\pm0.03$ for volume fractions of $0.111\le\phi\le0.832$, covering a
wide range of structures and dynamics. Surprisingly, our results are in
excellent agreement with the prediction of the kinetic theories of granular
gas, even for an extremely high volume fraction of $\phi=0.832$ where the
granular material forms a crystalline solid. Our experiment reveals that the
density-independent high-energy velocity tails of $\beta=1.50$ are a
fundamental property of uniformly heated granular matter.
