I agree, imagine if you were just sitting around figuring out what to do and the gun went off in the MRI possibly killing someone. The mistake was entry in the first place, not this
So the composition and the performance are two separate things. Sure the music was written and composed a long time ago and if you were to play your own version that would be fine. But the recording you have is not that old and has it's own copyright attached because they have transformed the public domain composition into their own performance.
You could just get a cheap adapter and a pack of a to c adapters.
I got my adapter from AliExpress https://www.aliexpress.us/item/3256806910619920.html