My music isn't working on my IPhone?

My IPhone 4 got an update, and then all of my music erased. When I plugged it back into my macbook pro, it said i needed to also update my macbook software, so I did. After that, none of the music could play. All of them apparently synced, but it took virtually no time, so I don't think they loaded. The songs are all on there, but they're a faded gray, not bold black, and I can't click on any of the songs. I tried syncing again, and only 4 songs synced, and were playable. I tried to remove the songs that aren't working, and I can't delete any. I tried to unsync the phone hoping it would remove the songs that don't work, but it only took away the songs that did. Help please! I need my music back on my phone. My apps all work and sync. Just the music is messing up right now.

Try reinstalling iTunes? Or if that doesn't work, restore. Hope for the best!

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