Old Ipod, new Mac....How do I get my music on my mac Itunes?

Please help. I used to be a PC person, now i have a Mac, but I haven't mastered it yet. I have an old IPOD I haven't used in a year that's charging, i'm trying to sync it with my mac Itunes, but it says it wont transfer the music I bought on my other computer's Itunes... So, how do I... show more Please help.

I used to be a PC person, now i have a Mac, but I haven't mastered it yet.

I have an old IPOD I haven't used in a year that's charging, i'm trying to sync it with my mac Itunes, but it says it wont transfer the music I bought on my other computer's Itunes...

So, how do I get all my music off my ipod and onto my mac?
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