MusOpen
https://musopen.org/faq/
https://en.wikipedia.org/wiki/Musopen
Musopen is a non-profit dedicated to providing copyright free music content: music recordings, sheet music and a music textbook. This project will use your donations to purchase and release music to the public domain. Right now, if you were to buy a CD of Beethoven's 9th symphony, you would not be legally allowed to do anything but listen to it. You wouldn't be able to share it, upload it, or use it as a soundtrack to your indie film- yet Beethoven has been dead for 183 years and his music is no longer copyrighted. There is a lifetime of music out there, legally in the public domain, but it has yet to be recorded and released to the public.
https://www.kickstarter.com/projects/Musopen/record-and-release-free-music-without-copyrights
Public Domain musical performances
https://archive.org/details/@musopen
Kickstarter DVD & Chopin
https://archive.org/details/MusopenKickstarterRecordings
https://archive.org/details/MusopenKickstarterRecordingsLossless
https://archive.org/details/musopen-chopin
Beethoven 0:10
Borodin 01:30:00
Brahms
Chopin
Dvorak 13:09:00
Grieg
Hayden
Mendelssohn
Mozart
Rimsky Korsakov
Franz Schubert
Smetana
Suk
Tchaikovsky
Bach - Goldberg Variations
LINUX -- Raspberry Pi 4b