Facts are not copyrightable, collections of facts are, thats why you cant copy google maps but you can go outside and write down the same data from your own observations. They have to be significant enough to be covered by copyright. A top 40 is maybe copyrighted.
Collections of facts are also not copyrightable. What's copyrightable is the editorial decision to include or exclude -- or, potentially, arrange -- some facts. This is why phone books weren't copyrightable - there is no creativity involved in choosing what's included ("everything") or the order in which entries appear ("alphabetical").
"Every charting hit" is also a comprehensive list involving no creativity. Order them chronologically and call it a day.
Some phone directories were said to include made up names and numbers that could be used to copyright phone directories. i.e. Company A provides a phone directory with a smattering of nonsense data contained within, Company B copies that wholesale which gives Company A ammunition in a copyright case as they point to the nonsense data and ask Company B to explain why they are included (which they obviously can't without saying, "We copied your directory"). This may just be urban lore.
