What did i do wrong with my music on my iphone?

Okay so I usually use my cousins laptop to put new music onto my iPhone 4.It's usually worked without a problem but this last time I put new music onto it something happened. My playlists disappeared and when I scrolled through my songs some of them were a faded gray and now I can't play them or swipe them to delete the song. What did I do wrong or what happened at least?

There Are Several Things You Can Do: You Can 1) Trey Re-Syncing Your iPhone 2) Restart Your iPhone 3) Manually Manage Your Music.

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