  We present a chemical composition analysis of 36 giant stars in mildly
metal-poor globular cluster M5. In comparing the M5 results to those obtained
in M4, a cluster previously considered to be a ``twin'' in age, metallicity and
chemical composition, we find large star-to-star variations in the abundances
of elements sensitive to proton-capture nucleosynthesis, similar [Fe/H] values,
but factor of two differences in some alpha-capture, odd-Z and slow
neutron-capture process elements. Among stars in globular clusters, apparently
there are no definitive ``single'' values of [el/Fe] at a given [Fe/H] for many
important elements.
