Last time I checked, dance sequences were not copyrightable. The physical description of the dance sequence is copyrightable, and you couldn't just take the author's published description and put it in your own collection w/o permission. You, on the other hand, could describe the dance with a different notation.
In every instance I have seen, publishers of dance collections have gone the extra step of getting permission from the dance author to include their dance. I'm not sure any of those Creative Commons licenses map exactly to this situation. Dan
