My songs don't have an album cover?

Ok, I BOUGHT THE SONGS ON ITUNES, and it would have them on my iPhone 5, but once I sync them with my iTunes on my computer the album cover goes away?

Also, I buy most of my albums in stores, so I can have the physical copy, and i'd transfer it to my iTunes and then onto my iPhone, but not all of the songs are under the album.

For example I have Rihanna's Unapologetic album, and the song Stay (and many more), aren't on the "Unapologetic" album, thery're on their own album with no album cover.

It's really irritating, help me fix it please?

There should be a way to add album art from files on your computer. So here's what you do: Google images search the album. Pick a picture that's at least a 500 x 500, feel free to go larger than that and make sure that it's square (doesn't have to be perfectly square (e.g: a 500 x 497 would work just fine. Download the full picture (as in view the original image and zoom in if you can on the pic, right click, click 'save as'. Title the picture as the name of the album. Save it to somewhere where you can find it on your computer.

Now go into iTunes (i don't use itunes, so i'm improvising here). There should be somewhere an option to choose your album art. To access this I would think that you could right click on the albun in itunes and there should be an option to add or update album art for that particular album. That should bring up another window which lets you choose what picture from your computer to use as the album cover. Simply find the picture you downloaded from the interwebs and double-click it and the artwork should be applied to that album. Again, I don't use iTunes, so I don't know for sure if this method will work. If not, you could always google how to do it.

You don't even need an album cover, yeezus aint got one and that all you need to hear ever

Http://www.creevity.com

Your welcome.

IF the album you want to do this to an album that is on the itunes store(must have all artist names/song names/etc exactly the same as on the store), you can just go to the settings on the top left, click library, and click "get album artwork".

If it's not on the itunes store:
1. Download the picture of the artwork onto your computer from the internet(must be a jpg file)
2. Right click on the song in your itunes library, click "get info", click on "artwork" which is the rightmost tab, click "add", and select the artwork you just downloaded.
3. If you want to set the artwork on a whole album(which I assume you want to do): click on the album in your library so that the individual songs drop down, right click on the album(probably just a music symbol for now), click on "get info".It will ask if you want to modify multiple items, say yes. Now on the first tab click on the square that says "artwork", and select the picture you previously downloaded.