So I just got a mac book, put all my music onto the macbook. At least I thought it was all my music, but on the iTunes on my macbook only has 550 songs. I have over 1300 songs on my ipod. I try to sync it but iTunes says that the iPod can only sync with one iTunes at a time, and if I sync I will have over half my music lost and only have 550 songs total. What do I do? How do I get all my music onto my macbook?