It depends how recently they wrote it.
Sergei Rachmaninoff wrote his piano concerto no 2 in 1901. He lived till 1943.
Eric Carmen used the melody from one movement in his 1975 hit “All By Myself” which he did not write all by himself. He thought it was public domain (and it was, in the US). But it wasn’t everywhere else, and he was contacted by the Rachmaninoff estate and they settled out of court for co-writing credit and 12% of revenues.
So watch out for classical that is recent.
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