Yeah that's fine, but it seems more like something you do for yourself, not the dead person. I still don't know why you think hearing lasts after death, but I'm pretty sure that a brain dead person can't hear. And if you freeze a body so it's in stasis, it can't hear anything. Even if it's thawed out and revived later, it won't have processed any audible input when it was non functioning. But we simply can't know the conscious experience of a dying person, so you are of course free to believe whatever you'd like.