Most of Hindemith’s works, although not under copyright in Canada, China, Japan, S. Korea, are protected in the U.S, and Europe.
It would be illegal to post links or scans of the music that could be downloaded in those countries.
“His publisher Schott will be looking for copyright violations”
Only Hindermith: Nuschi- Nuschi ©1921 Kalmus A6990, which has a harp part is PD in the U.S.
The IMSLP notice: These works may not be in the public domain in the US (due to first publication with the required notice after 1922) in the EU and those countries where the copyright term is life+70 years. However, they may be public domain in Canada (where IMSLP is hosted) and in other countries (China, Japan, S. Korea) where the copyright term is life+50 years.
Please obey the copyright laws of your country. IMSLP does not assume any sort of legal responsibility or liability for the consequences of downloading files that are not in the public domain in your country.