In your Account settings, you can set the Playlist contact information. This field populates the grouping field on all Songspace MP3s.
Note: If you're iTunes version is newer than 12.5.1, this field will populate in the iTunes work name field. For more information, click here.
To get to your Account settings, hover over your username in the top right of your home page and click Account from the dropdown menu.
To edit the Playlist contact information field, click the pencil icon.
After clicking the pencil icon, enter in the information and click the Save button.