  One of the hallmarks of molecular dynamics in deeply supercooled liquids is
the non-exponential character of the relaxation functions. It has been a long
standing issue if 'universal' features govern the lineshape of glassy dynamics
independent of any particular molecular structure or interaction. In the paper,
we elucidate this matter by giving a comprehensive comparison of the spectral
shape of depolarized light scattering and dielectric data of deeply supercooled
liquids. The light scattering spectra of very different systems, e.g. hydrogen
bonding and van der Waals liquids but also ionic systems, almost perfectly
superimpose and show a generic lineshape of the structural relaxation,
approximately following a high frequency power law $\omega^{-1/2}$ . However,
the dielectric loss peak shows a more individual shape. In systems with low
dipole moment generic behavior is also observed in the dielectric spectra,
while in strongly dipolar liquids additional crosscorrelation contributions
mask the generic structural relaxation.
