My music for my ipod touch came up in itunes but when i disconnect my ipod says i...

...have no music or videos? well here'sthe thing i did music rescue on my ipod nano, saved it on itunes, then i transffered it to my ipod touch. with it still connected it says that i have all my music(on itunes) but when i disconnect it my ipod touch says i have no videos and only one song. can someone please help me? i had about 800 songs and it will take me days to add them back.
 
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