UPDATED: Artist to Album Artist v3.0
Artist to Album Artist v3.0 will copy the Artist tag to the Album Artist tag of the selected tracks.
Sorry there's no screenshot but...there's no UI to show. The thing does what it says with little fuss.This latest version is a maintenance update for compatibility with iTunes11+/OS X 10.9+. I find myself needing to use this pretty frequently after ripping CDs or re-adding files.