Just as an example of how complicated the copyright aw can be read this:
http://www.slate.com/articles/news_and_politics/explainer/1999/12/why_wonderful_life_comes_but_once_a_year.html
Also, I studied the history of the song "A Lion Sleeps Tonight." It was originally a Zulu folk song. A version of it appeared in the first Boy Scout Manual as a scout marching song with words similar to the Zulu words, written by Robert Baden-Powell, who heard the Zulu version while serving the British Army during the Boer Wars. . In 1939, in South Africa, a gent named Solomon Linda and his group recorded their arrangement. It was Solomon;s arrangement that had the high pitched falsetto yodel type performance. (You can listen to the original here:
) The record had few sales, but a copy found it's way to Decca records, where it sat for ten years and then was to be thrown out. A music historian was given the pile of trash records. He approached a musician named Pete Seeger whose folk group, the Weavers, recorded it as Wimoweh in the early 1950's. Several Groups recorded versions of the song and then in 1961, a Brooklyn doo-wop group recorded the song as In The Jungle the Lion Sleeps Tonight. That recording and arrangements made a few reprisals in popularity over the years and then was used by Walt Disney Company in the movie the Lion King. Each time the song was recorded a different copyright attached, sometimes just to the changes. Solomon Linda sold his rights to the song in 1939 for the equivalent of about $2.50. However, under a fluke of law, the rights reverted back to his heirs 25 years after his 1961 death, so in 1986, the family became owners of his arrangement again. Around 1999, the South African Gov't, in trust for the destitute heirs, sued for copy right infringement, Sued Everybody, Capitol, Decca, Disney, etc. The case was settled for 11 million dollars payable to the family of Solomon Linda.
As you can see, it gets very convoluted.