Frequently asked questions on copyright, fair use, preservation and various other issues related to music copyrights and licensing, edited by the Music Library Association. Website also includes links and bibliography.
Reference chart determines copyright status of a given work.
The purpose of this site is to "make universally available information about U.S. music copyright infringement cases from the mid-nineteenth century forward." Includes coverage of recent copyright disputes, an overview of the judgments of prior cases, and a glossary of relevant terms.
A brief, handy music video by blogger and musician David Holmes explaining the ins and outs of copyright and fair use.
"Information on this Site is Based Entirely on USA Copyright Laws. Any Song or Musical Work Published in 1922 or Earlier is in the Public Domain in the USA."