When I search for a song or artist, all the results are blank?

I first noticed it when searching for my foreign music. Will Pan, Tanjib Sarowar, Sponge Cola, etc. Whether I search the song, or the artist, all the results are blank. Under songs, albums, podcasts, EVERYTHING is blank. I thought the music wasn't available. Then I started to wonder more, so I decided to search some American artists. Carrie Underwood, Train, Imagine Dragons, Taylor Swift, etc. They were still blank. This made me realize the problem wasn't that there was no music, but something is wrong with my iTunes. I restarted my computer, and I still have the same problem. What do I do?