pierre.chepelov wrote:If the (original) words are still copyrighted, then the music stay copyrighted also, even if its composer died 100 year ago.
The author of the words and the composer have the same status of "co-authors", and the protection delay starts with the death of the last surviving one.
I don't think it is that simple. If the texts and the music can be considered as a single, entangled work, the composer and the song writer will have joint authorship, making the copyright in most countries based on the longest surviving person. If the text or music can be considered derivative works of the other, the copyright of the derived work in most countries will last as long as the longest surviving person, but the copyright on the original only as long as the one person who made it. If both are entirely separate works (unlikely), both copyrights are independent.