This is an enhancement request to add an optional 

category:<album|artist|track|title|genre|...>

tagged parameter to a "globalsearch" query.

What the parameter would do is: it would be preserved (passed on) while browsing the globalsearch menu structure and whenever a search-submenu branches between these categories (almost all menus do that at some point) that menu will be skipped and the sumbenu defined by the category would be delivered instead.

This way a search like

globalsearch items 0 100 menu:globalsearch search:Paul%20Weller category:artist

would:
in "My Music", select the Submenu "Artist"
in "Rhapsody" select "Search for Artist"
in "Last.fm" select "Enter Artist"
and so on...
probably not show "Album Review" but do show "Biography".

Menus that don't use one of these tagged categories would simply ignore the tag and pass it on to submenus.

This way it would be simple to implement a context search through the globalsearch facility.