@Gospel_John said:
How long has the author been dead?
It’s safe to adapt anything that’s pre-1923.
After that it’s confusing… and now copyright covers life of author plus 70 years.
http://copylaw.com/new_articles/PublicDomain.html
Not quite, Jazz and Jazz variants (Blues) are not cleared by the 1923 date. Since this type of music was done without sheet music it was long considered to bypass the copyright law and never expire.
When they finally updated the law to include publication of the music with out without sheet music it was 70 years from the amendment, not from production. Therefore, those music pieces from the pre 20’s is protected well past the 2020’s.
Safe bets are so safe, there are loopholes riddled all over the place.
Dudley Do-Right says:
“If it’s worth doing, it’s worth doing right!”
“Remember to always look before crossing the road.”