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We present a study of the globular cluster (GC) systems of nearby ellipticaland S0 galaxies at a variety of wavelengths from the X-ray to the infrared. Ouranalysis shows that roughly half of the low mass X-ray binaries (LMXBs), thatare the luminous tracers of accreting neutron star or black hole systems, arein clusters. There is a surprisingly strong correlation between the LMXBfrequency and the metallicity of the GCs, with metal-rich GCs hosting threetimes as many LMXBs as metal-poor ones, and no convincing evidence of acorrelation with GC age so far. In some of the galaxies the LMXB formation ratevaries with GC color even within the red peak of the typical bimodal clustercolor distribution, providing some of the strongest evidence to date that thereare metallicity variations within the metal-rich GC peak as is expected in ahierarchical galaxy formation scenario. We also note that any analysis ofsubtler variations in GC color distributions must carefully account for bothstatistical and systematic errors. We caution that some published GCcorrelations, such as the apparent 'blue-tilt' or mass-metallicity effect mightnot have a physical origin and may be caused by systematic observationalbiases.

Clues to Globular Cluster Evolution from Multiwavelength Observations of Extragalactic Systems