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I have Itunes on multiple computers. Each computer has a slightly different song list in Itunes.

I used an external harddrive to import all music to each computer. I was able to download most of my music collection to 1 computer. However, some songs are not available for download even though I downloaded them from CD's long ago.

I want to consolidate and download 100% of my music onto one computer. The "download" option does not appear. Some songs have the icloud symbol, some do not. Either way I am given the option to download. Help