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 Past Masters vs. Rarities 

I'm creating a chart for my own use that includes U.S. albums, since there are so many differences in the early albums. As a U.S. fan, I'm faced with the issue of whether to have U.S. albums, U.K. albums or both on my iPod? I will post my chart on my talk page so that others can judge whether it's worthy of including here. I realize there will be problems, including the lack of Canadian albums. My purpose is simply to record the first ALBUM appearance in both the U.K. and U.S. of each song.

I notice that a number of U.K. songs are listed as Past Masters when they actually first appeared on Rarities (1978 The Beatles album). I don't know the reason for this if the purpose is to list the first appearance on an album. Can someone explain? Or should they be changed to Rarities?  "