Yes!
https://support.plex.tv/articles/200265296-adding-music-media-from-folders/
Proper naming for music files- first time setup for plex - #3 by OttoKerner
‘.38 Special’ is funny - everywhere but Windows, a period . at the beginning of a file name has the effect of hiding that file/folder. Windows doesn’t behave that way, but it’s possible the Plex scanner does treat it that way.
There are some great tools like FileBot and bliss for doing this.
iTunes can do a good job of it, too. I kinda like this one for 1) not being iTunes 2) the price 3) supporting many formats:
Mp3tag:
Mp3tag - the universal Tag Editor (ID3v2, MP4, OGG, FLAC, ...)
