Authorizing my computer hundreds of times still doesn't sync my iphone 5s. What do I do?

I've tried everything. Deleting that sc info file, upgrading my itunes, signing in and out, made sure that I signed in with the same account on my phone as on my computer.

Nothing is working! I need music on my phone!

Found the solution! I had two apps from a different id on my phone. Deleted them, and it worked like a charm!