Hello there, Diecast Joe.
It sounds like some of your music imported from CDs is missing artwork once imported into iTunes. The following Knowledge Base articles provides a few options for getting the artwork back:
iTunes 12 for Windows: If you don’t see song information
When you insert a CD in your computer’s disc drive (or an external drive connected to your computer), iTunes finds the CD in the Gracenote media database on the Internet and displays the name and other track information for each song. If songs appear as “Track 01,” “Track 02,” and so on, either you aren’t connected to the Internet or iTunes can’t find the CD’s information.
If you’re not connected to the Internet, you can import the songs anyway, and look up the CD information the next time you’re connected.
If your network uses an HTTP proxy, make sure the settings in the Internet Options control panel are correct.
Additionally, you can manually add artwork if the GraceNote database is empty:
iTunes 12 for Windows: Add artwork to songs and other items
Music and video you buy from the iTunes Store comes with artwork. You can add your own artwork to songs and other items in your library.
You can add many types of still image files, including JPEG, PNG, GIF, TIFF, and Photoshop. You must convert WAVfiles to another format before you can add artwork to them.
Do any of the following:
Add artwork to one item at a time:
- Select an item in your iTunes library and choose File > Get Info.
- Click Artwork and do one of the following:
- Click Add Artwork, select an image file, and click Open.
- Drag the art file to the artwork area.
Add the same artwork to multiple items: Select the items, choose File > Get Info, click Info, and drag an image file to the Artwork area.
Retrieve album artwork from the iTunes Store for songs in your library: Control-click the songs and choose Get Album Artwork.
Thanks for participating in Apple Support Communities.
Kind Regards