Help with a Tag

I have some Various Artist files (about 1000) in which the track Title is given as:
Jailhouse Rock - Elvis Presley

I would like to extract from this the Artist as Elvis Presley saving it to Artist and leaving Jailhouse Rock as the Title.

Doing this manually would drive me nuts!!

Thanks

Create an action of the type "Guess value" for %title%
Guessing pattern: %title% - %artist%
and apply it

Came out as Artist: Rock - Elvis Presley
and Title as: Jailhouse

Sorry, sorry sorry....this donkey forgot the hyphen

Works perfectly

There has to be a hyphen between %title% and %artist%:
%title% - %artist%

Otherwise you use the blank as a field separator.