iTunes says there is music on my iPhone but it's not showing up!

iTunes says it is syncing with my iPhone, and it says there is music on the iPhone. However, on the 'iPod' section of my iPhone, there is nothing there! I have synced multiple times (am also having LOADS of issues with files that iTunes says are corrupted when I'm trying to sync, even though they will play quite happily through iTunes) and I have changed the cable I'm using to connect my iPhone to my PC.

Can anybody help?