Yeah, loud bands. Whatever. If you want quiet, wait until the crowd clears out and then walk the entire World Showcase in relative peace, which I do several times in my stays.
With that being said, some live music is too loud, whatever the venue. I've been to wedding receptions where the music of the band was so loud that most people were out in the hall so they could talk, and the reception hall was nearly empty. If Mo' Rockin is too loud, I move on. If it's peaceful enough to talk with my family, we may stick around, spend some money or grab some food at the Pavilion. In my opinion, loud is overall bad for business, but I'm no expert.
With that being said, it's great to sit at lagoon side restaurants in Mexico and UK and take in all the music. You can hear parts of Off Kilter, the Brit Band, the Japanese drums, and Mo' Rockin at different times. It's great. And soon Morocco will have its own lagoon side restaurant. Can't wait. Hopefully the music won't be too loud.