I use MP3 Tag.... freeware...your DJ software wont read the name of the file as its seen in your screenshot, but the metadata, which you can amend using MP3Tag...and yeah, highlight all then rename for artist
Download Mp3tag, a powerful and easy-to-use tool to edit metadata of audio files
www.mp3tag.de
-though that doesn't solve your problem as yes you do still want to rename the file name too, for the sake of tidyness as much as anything. I still use MP3tag for that , and copy and paste the artist name in, much easier in MP3Tag that in a desktop folder
ideally you want both real filename and metadata all present and correct
sometimes you can copy the artist name out of the metadata and into the filename bit... very clear and quick and easy in mp3tag, give it a try
also recommend getting MP3 Gain and leveling them all to around 92db, to stop one track playing louder than another...this does not affect the quality of the MP3
also freeware
MP3Gain Downloads
i spend so much time doing all this its ridiculous
I like to add years and original cover art and record label info, plus my own notes