What's wrong with my ipod?

My iPod shows only 5 artists on it, but when I plug it into iTunes, it shows all of the artists that should be on there. Why aren't all of them showing on my iPod? I had to restart my iPod and i restarted iTunes. It doesn't need updated. What's wrong with it?

2012-04-23T22:35:49Z

I know. I can't add new songs. It always says error. I know how to work the iPod. I've had one for a couple years.

Patrick2012-04-23T22:09:58Z

u have to put the songs on ur ipod