Lovie, did you call your TA to have your cabin changed? Maybe they can get you on deck 7 (Verandah) with an OBC. We used to always book deck 8 aft, but now book 7 aft - starboard. I recall that on 8, we would hear the music which was nice and we could fall asleep to it. Also, we would hear occasional running and occasional chair scraping - it seemed most of that ended around 10 or so.
Also, noise will depend on where your cabin is - some areas on deck 8 don't have so much noise. You can hear the music from the Lido deck if your balcony door is open on 7 or 8.
You should also look at the deck plan to see where your cabin is and what is above it. The cabin you ended up with might be fine! What cabin do you have?