icon for iTunes 10.7/music missing from System Preferences in Snow Leopard
Solution 1:
By reinstalling iTunes, did you completely trash the application and then copy it anew? Sometimes simply overwriting the existing installation doesn't do the trick.
Solution 2:
Reinstall iTunes. The icons in the Spotlight preference window and other areas of OSX are mostly derived from the application bundle. It looks like the iTunes icon package has become corrupted. A reinstall will eliminate that as the reason.