KJ File Manager
Latshaw Systems will do this with ease.
http://www.latshawsystems.com/
Once Open, you will set the "FILE TITLE FORMAT" to "A-T Format (Artist - Title)"
Click "IMPORT"
When the Files are imported, Highlight ALL files, to be changed, by Left Clicking the Mouse and DRAGGING down to Highlight Multiple Files, which turns all selected files to an Orange color. Then, Right Click anywhere on the ORANGE (Selected Files) and Choose "SWAP FIELDS" "ARTIST< > TITLE"
You have:
1234spacedashspaceABDC
You Get:
ABCDspacedashspace1234