Playlist/smart playlist for top charts

I am looking to try to make a smart playlist or regular playlist for Billboards or iTunes top music charts for music I have. I see some people mentioning they populate one of the fields (comments) of each song with the chart info. Can someone point somewhere explaining how to do this?

Is this the best/easiest way to do what I want?

I would like to be able to keep the list updated if possible but would like to just get the current chart playlist if possible.



Thanks for any help or tips you can give me.

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