i purchased a song on my iphone via itunes wifi store and i connected it to my computer, and the song wouldn't sync, i ejected it and reconnected, and the song disappeared from my iphone but did not show up on my computer. i tried to buy the song again via itunes (computer) but it told me "you have already purchased this song"... i dont' really want to buy teh same song again and i was wondering if anyone knows what happened?