Some of my music from iTunes won't sync to my iPhone 4s?

I bought a CD the other day and wanted to import it into my iTunes library, so I could sync it to my iPhone 4s. The CD imported just fine, and when I plugged in my phone to my MacBook, I made sure that the artist and the album was checked under the music tab, but when I go to sync it and it is complete, it doesn't show up on my phone? I have tons of space left on my phone and again, I have the artist and album checked, so I don't understand.

It sounds like the songs that won't sync aren't tagged properly with the Artist and Album. That typically doesn't happen when you rip a CD but I have seen it happen.