Context: there is a collection of public domain work (example A: collection of poems; example B: collection of classical music), let's say "50 most ... X".
Any annotation, organisation, etc. (including arrangement, typography) is under copyright protection for this anthology, without question.
My question is: is the collection itself, i.e., which 50 pieces of something are together, copyrighted?
More concrete question: am I allowed to create a different publication, with different annotations, but with the same 50 pieces of something without infringing copyright?