A multipart series of blog posts on “Copyright Basics for Dance Works” written by Michelle N. Burkhart and published online in 2011. The information is specific to dance and the types of issues dancers or choreographers are likely to encounter.
Professional organization's guide to copyright. Contains descriptions and links to relevant laws and legal decisions as well as links to other resources. Last update appears to have been in 2019.
This document is intended to help lawyers who do not specialize in music copyright understand the law quickly. It lists all the types of rights one has to keep in mind for a performance or recording.