  I describe very briefly the new libraries of empirical spectra of stars
covering wide ranges of values of the atmospheric parameters Teff, log g,
[Fe/H], as well as spectral type, that have become available in the recent
past, among them the HNGSL, MILES, UVES-POP, and Indo-US libraries. I show the
results of using the HNGSL to build population synthesis models. These
libraries are complementary in spectral resolution and wavelength coverage, and
will prove extremely useful to describe spectral features expected in galaxy
spectra from the NUV to the NIR.
