It depends on the type of work and the country of origin.
In the US, current unpublished works are protected for the life of the creator plus 70 years, the same as a published work. This is not the case for pre-1977 unpublished works, which would be in the public domain.
The Berne Convention allows different term for films: "in the case of cinematographic works, the countries of the Union may provide that the term of protection shall expire fifty years after the work has been made available to the public with the consent of the author, or, failing such an event within fifty years from the making of such a work, fifty years after the making."
Generally 70 years past the death of the author. In the case of work-for-hire then the shorter of 95 years post publication, or 125 years post creation.
A work is protected by copyright as soon as it is fixed in a tangible medium, i.e. even before it was published.
Under US Copyright Law, copyright attaches as soon as a work is created, whether published or not. Published or unpublished works do not need to be "signed" to fall under copyright protection because the creation of a work already establishes copyright ownership.
Text is not copyright-free unless it was created or published so long ago that the copyright has expired, or if the text does not qualify as having sufficient "creative work of original authorship" to trigger any copyright protection.
Publication is not necessary for a work to be protected by copyrighted. Unpublished works can be submitted for copyright registration and published at a later date.
At this time, in the US, copyright term is life of the author plus 70 years, assuming the work was published after 1977, or was created prior to that but unpublished. In other countries the duration generally varies between 50 and 90 years after death of the author. For sound recordings in the USA, published prior to 1972, copyright is only under state laws, which do not expire, but will be pre-empted by federal law in 2067.
Generally, at least under US Law, copyright protection extends 70 years past the death ot the author/creator of the work.
It depends on whether it was formally registered (and when), whether it was renewed, and more. The short answer is 95 years, but the long answer is check out the link below.
Let people know that you believe your music is protected by copyright: You should always write the international copyright symbol ©, the name of the copyright owner (i.e. you the composer or any publisher to whom the copyright may have been assigned) and the year in which the work was first published (or written if not yet published) in a prominent position on the original and every copy of the work. This will put users on notice of the fact that the work may be protected by copyright
The copyright date of each element of this website may be different according to when it was published and whether it was the work of an individual or of an employee of a company.
Under US law, yes. A work is protected by copyright as soon as it is created, and it would be a violation of copyright to copy IN ANY WAY even an unpublished draft work without the consent of the copyright holder.
Not necessarily, but if you are using a nickname or pseudonym for publishing, it would be worthwhile to note that in the copyright registration.
In most cases, for work published after 1923, copyright will expire at the end of the calendar year 70 years after the death of the original author.