Why won't my iphone 4 sync with my itunes library?

For some reason it does not work. I tried automatically syncing it and manually, but I can only get the songs if it is in a playlist. I want to be able to see all of the songs by artist though and the new songs are not under there. Also, some of the artists have spelling errors which I fixed on my itunes library, but which won't come up in my iphone. Really annoying. It used to be I just plugged in my ipod and everything synced with the itunes library.

Try updating itunes

You sure you just didn't hit the Playlist button on your iPhone? Try hitting SONGS.