How2 batch file rename every artist in my catalog

All of my artist names, over 500, are listed as last name, first name. For example, Bowie, David or Sinatra, Frank. I've been doing this since the beginning of time (or thereabouts ha, ha). I would now like to change them all back to 'normal'; Having first their given name and then their family name. In the ex. above this would mean to now have then as David Bowie and Frank Sinatra (deleting the comma used b4 as well).
Is it possible to do so in batch? If so how please?
Thank you

Create an action of the type "Replace with regular expression" for the field (probably ARTIST).
Enter as search string:
(.), (.)
Enter as target string:
$2 $1

Will not work with artists like Earth, Wind & Fire or Dave, Dee, Dozy, Beaky, Mick and Titch.

You're a godsend -thanks a mil