For all practical purposes on Local Bands Wiki, the public domain comprises copyright-free works: anyone can use them in any way and for any purpose. Proper attribution to the author or source of a work, even if it is in the public domain, is still required to avoid plagiarism.
The public domain is generally defined (e.g. by the U.S. Copyright Office) as the sum of works that are not copyrighted, i.e. that were not eligible for copyright in the first place, or
- whose copyright has expired, or
- that were released into the public domain by the copyright holder.
However, there is no such thing as the public domain on the Internet. International treaties, like the Berne Convention, are not self-executing and do not supersede local law. There is no globally valid "International Copyright Law" that would take precedence over local laws. Instead, signatory countries of the Berne Convention have adapted their laws to comply with the minimum standards set forth by the treaty, often with stronger provisions than required. Whether or not something is copyright-free in some country depends on the laws of individual countries.
Local Bands Wiki, and MCZ.com, its legal body, are based in California, United States. Although legislation is sometimes unclear about which laws are to apply on the Internet, the primary law relevant for Local Bands Wiki is that of the United States. For re-users of Local Bands Wiki content, it is the laws of their respective countries.
In the U.S., any work published before January 1, 1923 anywhere in the world is in the public domain. Other countries are not bound to that 1923 date, though. Complications arise when special cases are considered, such as trying to determine whether a work published later might be in the public domain in the U.S., or when dealing with unpublished works. When a work has not been published in the U.S. but in some other country, that other country's copyright laws also must be taken into account.