Help Me My iTunes Library ( For Music ) disappear T^T

music in my itunes library disappear 😢😢😢 and yah cause I downloaded the new version of iTunes 11.04 and not compatible with ios 5 (I'm so stupid hehe) 😁😁 bcoz i try to sync take a loooong time ( boring ) 😠 😢

I wanted to ask how to move music in my iphone to itunes music library? 😉

any solution? thanks 😍