SVN move a local working sub-dir containing some unversioned files

SVN move a local working sub-dir containing some unversioned files

I have a structure a bit like
/work_dir
/resources
/sounds
/game_sounds
I want to move game_sounds into sounds without losing history, but it
contains some unversioned files which need to stay unversioned.
Is there a SVN command that can do this in one operation, if so what would
I do... and if not what would I do then?
(using svn client 1.6)