If you are really having a great cruise and partaking in all the activities and off shore experiences, and the evening activities, you will never hear a thing as when your head hits the pillow, it will be Sweet Dreams....
We were on the Rhapsody last Sept, and I remember the music being very loud in the hallway, but when the cabin door was closed, not a sound. Also, we were very close to the elevator/stairs. Never heard anything. Those rooms are practically soundproof.