How to get my album covers back?

I got iOS 8 on my iPhone 5c yesterday and everything was great but then I went in my iTunes and noticed over half of my albums don't have their covers anymore. It just says the band and then the album. How can I get the actual album cover back?

Hmm that sounds weird, may be a glitch lol, iOS is famous for first-month glitches. Anyway, you could do each one manually, you know, "get album artwork"… Good luck!