Two views of globular cluster stars in the Galactic halo
  In Martell & Grebel (2010) we reported the discovery in the Sloan Digital Sky
Survey-II/SEGUE spectroscopic database of a small subset of halo red giants,
2.5%, with CN and CH band strengths indicative of globular-cluster-like carbon
and nitrogen abundances. Because the formation of stars with unusual
light-element abundances is thought to be restricted to high-density
environments like globular clusters, this result has strong implications for
both cluster formation processes and the assembly history of the Galactic halo.
Here we discuss two efforts to expand upon that work.
