It's important to remember that the musical score is different from the musical performance. What you're talking is a performance by a bunch of professional musicians who get paid, put together by a team of audio engineers who also get paid, who were using equipment costing thousands of dollars, while the musicians were playing using instruments costing hundreds or thousands of dollars apiece as well.
Even though Beethoven died more than seventy years ago, it's not like he burned a bunch of CDs of the performances of his music back then. All of the copies of his music you're going to find have been done by musicians in the last seventy years. And I'd love to see you try and explain to all of the musicians in the orchestra that their performance was completely devoid of any creativity so they don't deserve any kind of copyright protection whatsoever.

Beethoven is remember for his composition, not for his performances. Elvis is remembered for his performances, not for his composition.