How do you move album folder into another artist folder?

I purchased from iTunes two Earth, Wind & Fire albums but iTunes put album A in an artist folder called "Earth, Wind & Fire" and put album B in an artist folder called "Earth Wind & Fire". The difference being one artist folder has a comma; the other does not. I would like to put both albums in the artist folder called "Earth, Wind & Fire". I tried using Windows Explorer to cut and paste album B into the "Earth, Wind & Fire" artist folder and then delete the comma-less artist folder but the comma-less artist folder still shows up in the iTune's artist list and album B does not show up when I click on the "Earth, Wind & Fire" artist icon.

So what is the correct way to solve this problem?